331564997 has 4 divisors (see below), whose sum is σ = 335559840. Its totient is φ = 327570156.

The previous prime is 331564993. The next prime is 331565009. The reversal of 331564997 is 799465133.

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 331564997 - 2² = 331564993 is a prime.

It is a super-2 number, since 2×331564997² = 219870694471220018, 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 (331564993) 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, 1997297 + ... + 1997462.

It is an arithmetic number, because the mean of its divisors is an integer number (83889960).

Almost surely, 2^331564997 is an apocalyptic number.

It is an amenable number.

331564997 is a deficient number, since it is larger than the sum of its proper divisors (3994843).

331564997 is an equidigital number, since it uses as much as digits as its factorization.

331564997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994842.

The product of its digits is 612360, while the sum is 47.

The square root of 331564997 is about 18208.9263000321. The cubic root of 331564997 is about 692.1330038544.

The spelling of 331564997 in words is "three hundred thirty-one million, five hundred sixty-four thousand, nine hundred ninety-seven".