991652431 has 8 divisors (see below), whose sum is σ = 1236345984. Its totient is φ = 772716120.

The previous prime is 991652393. The next prime is 991652447. The reversal of 991652431 is 134256199.

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

It is not a de Polignac number, because 991652431 - 2¹¹ = 991650383 is a prime.

It is a super-2 number, since 2×991652431² = 1966749087816419522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991652131) 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, 6439225 + ... + 6439378.

It is an arithmetic number, because the mean of its divisors is an integer number (154543248).

Almost surely, 2^991652431 is an apocalyptic number.

991652431 is a deficient number, since it is larger than the sum of its proper divisors (244693553).

991652431 is a wasteful number, since it uses less digits than its factorization.

991652431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12878621.

The product of its digits is 58320, while the sum is 40.

The square root of 991652431 is about 31490.5133492612. The cubic root of 991652431 is about 997.2096984589.

The spelling of 991652431 in words is "nine hundred ninety-one million, six hundred fifty-two thousand, four hundred thirty-one".