964623921 has 4 divisors (see below), whose sum is σ = 1286165232. Its totient is φ = 643082612.

The previous prime is 964623893. The next prime is 964623941. The reversal of 964623921 is 129326469.

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 964623921 - 2⁵ = 964623889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (964623941) 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, 160770651 + ... + 160770656.

It is an arithmetic number, because the mean of its divisors is an integer number (321541308).

Almost surely, 2^964623921 is an apocalyptic number.

It is an amenable number.

964623921 is a deficient number, since it is larger than the sum of its proper divisors (321541311).

964623921 is a wasteful number, since it uses less digits than its factorization.

964623921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321541310.

The product of its digits is 139968, while the sum is 42.

The square root of 964623921 is about 31058.3953384588. The cubic root of 964623921 is about 988.0661227717.

The spelling of 964623921 in words is "nine hundred sixty-four million, six hundred twenty-three thousand, nine hundred twenty-one".