919138286089 has 9 divisors (see below), whose sum is σ = 936859521493. Its totient is φ = 901746200992.

The previous prime is 919138286069. The next prime is 919138286113. The reversal of 919138286089 is 980682831919.

The square root of 919138286089 is 958717.

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

It can be written as a sum of positive squares in 4 ways, for example, as 395697612025 + 523440674064 = 629045^2 + 723492^2 .

It is not a de Polignac number, because 919138286089 - 2²³ = 919129897481 is a prime.

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 919138286089.

It is not an unprimeable number, because it can be changed into a prime (919138286069) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 50802957 + ... + 50821045.

Almost surely, 2^919138286089 is an apocalyptic number.

919138286089 is the 958717-th square number.

919138286089 is the 479359-th centered octagonal number.

It is an amenable number.

919138286089 is a deficient number, since it is larger than the sum of its proper divisors (17721235404).

919138286089 is an frugal number, since it uses more digits than its factorization.

919138286089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36284 (or 18142 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 64.

Multiplying 919138286089 by its sum of digits (64), we get a square (58824850309696 = 7669736²).

The spelling of 919138286089 in words is "nine hundred nineteen billion, one hundred thirty-eight million, two hundred eighty-six thousand, eighty-nine".