128902693481 has 4 divisors (see below), whose sum is σ = 128908535952. Its totient is φ = 128896851012.

The previous prime is 128902693411. The next prime is 128902693487. The reversal of 128902693481 is 184396209821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128902693481 is a prime.

It is a super-2 number, since 2×128902693481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128902693487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2888015 + ... + 2932308.

It is an arithmetic number, because the mean of its divisors is an integer number (32227133988).

Almost surely, 2^128902693481 is an apocalyptic number.

It is an amenable number.

128902693481 is a deficient number, since it is larger than the sum of its proper divisors (5842471).

128902693481 is an equidigital number, since it uses as much as digits as its factorization.

128902693481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5842470.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The spelling of 128902693481 in words is "one hundred twenty-eight billion, nine hundred two million, six hundred ninety-three thousand, four hundred eighty-one".