921694431 has 8 divisors (see below), whose sum is σ = 1404486784. Its totient is φ = 526682520.

The previous prime is 921694429. The next prime is 921694441. The reversal of 921694431 is 134496129.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 921694431 - 2¹ = 921694429 is a prime.

It is a super-2 number, since 2×921694431² = 1699041248272827522, which contains 22 as substring.

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 921694431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921694441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21945085 + ... + 21945126.

It is an arithmetic number, because the mean of its divisors is an integer number (175560848).

Almost surely, 2^921694431 is an apocalyptic number.

921694431 is a deficient number, since it is larger than the sum of its proper divisors (482792353).

921694431 is a wasteful number, since it uses less digits than its factorization.

921694431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43890221.

The product of its digits is 46656, while the sum is 39.

The square root of 921694431 is about 30359.4207948702. The cubic root of 921694431 is about 973.1855559122.

The spelling of 921694431 in words is "nine hundred twenty-one million, six hundred ninety-four thousand, four hundred thirty-one".