909918121 has 4 divisors (see below), whose sum is σ = 1039906432. Its totient is φ = 779929812.

The previous prime is 909918109. The next prime is 909918143. The reversal of 909918121 is 121819909.

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 not a de Polignac number, because 909918121 - 2⁹ = 909917609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (909919121) 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, 64994145 + ... + 64994158.

It is an arithmetic number, because the mean of its divisors is an integer number (259976608).

Almost surely, 2^909918121 is an apocalyptic number.

It is an amenable number.

909918121 is a deficient number, since it is larger than the sum of its proper divisors (129988311).

909918121 is a wasteful number, since it uses less digits than its factorization.

909918121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129988310.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 909918121 is about 30164.8490962577. The cubic root of 909918121 is about 969.0230433626.

The spelling of 909918121 in words is "nine hundred nine million, nine hundred eighteen thousand, one hundred twenty-one".