128926237969 has 3 divisors (see below), whose sum is σ = 128926597033. Its totient is φ = 128925878906.

The previous prime is 128926237883. The next prime is 128926237981. The reversal of 128926237969 is 969732629821.

The square root of 128926237969 is 359063.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 969732629821 = 5483 ⋅176861687.

It is not a de Polignac number, because 128926237969 - 2²¹ = 128924140817 is a prime.

It is a super-2 number, since 2×128926237969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128926237969.

It is not an unprimeable number, because it can be changed into a prime (128926237169) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 179532 + ... + 538594.

Almost surely, 2^128926237969 is an apocalyptic number.

128926237969 is the 359063-rd square number.

128926237969 is the 179532-nd centered octagonal number.

It is an amenable number.

128926237969 is a deficient number, since it is larger than the sum of its proper divisors (359064).

128926237969 is an frugal number, since it uses more digits than its factorization.

128926237969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718126 (or 359063 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 64.

Multiplying 128926237969 by its sum of digits (64), we get a square (8251279230016 = 2872504²).

It can be divided in two parts, 1289262 and 37969, that added together give a palindrome (1327231).

The spelling of 128926237969 in words is "one hundred twenty-eight billion, nine hundred twenty-six million, two hundred thirty-seven thousand, nine hundred sixty-nine".