909097981261 has 4 divisors (see below), whose sum is σ = 938423722624. Its totient is φ = 879772239900.

The previous prime is 909097981243. The next prime is 909097981271. The reversal of 909097981261 is 162189790909.

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-909097981261 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 909097981261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (909097981271) 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, 14662870635 + ... + 14662870696.

It is an arithmetic number, because the mean of its divisors is an integer number (234605930656).

Almost surely, 2^909097981261 is an apocalyptic number.

It is an amenable number.

909097981261 is a deficient number, since it is larger than the sum of its proper divisors (29325741363).

909097981261 is a wasteful number, since it uses less digits than its factorization.

909097981261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29325741362.

The product of its (nonzero) digits is 4408992, while the sum is 61.

The spelling of 909097981261 in words is "nine hundred nine billion, ninety-seven million, nine hundred eighty-one thousand, two hundred sixty-one".