925421991 has 8 divisors (see below), whose sum is σ = 1328811120. Its totient is φ = 569490432.

The previous prime is 925421989. The next prime is 925422007. The reversal of 925421991 is 199124529.

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

It is not a de Polignac number, because 925421991 - 2¹ = 925421989 is a prime.

It is a super-2 number, since 2×925421991² = 1712811722852808162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (925421941) 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, 11864346 + ... + 11864423.

It is an arithmetic number, because the mean of its divisors is an integer number (166101390).

Almost surely, 2^925421991 is an apocalyptic number.

925421991 is a deficient number, since it is larger than the sum of its proper divisors (403389129).

925421991 is a wasteful number, since it uses less digits than its factorization.

925421991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23728785.

The product of its digits is 58320, while the sum is 42.

The square root of 925421991 is about 30420.7493497448. The cubic root of 925421991 is about 974.4957255567.

The spelling of 925421991 in words is "nine hundred twenty-five million, four hundred twenty-one thousand, nine hundred ninety-one".