331972561 has 4 divisors (see below), whose sum is σ = 333197824. Its totient is φ = 330747300.

The previous prime is 331972559. The next prime is 331972573. The reversal of 331972561 is 165279133.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165279133 = 7177 ⋅23029.

It is a cyclic number.

It is not a de Polignac number, because 331972561 - 2¹ = 331972559 is a prime.

It is a super-2 number, since 2×331972561² = 220411562513797442, 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 331972561.

It is not an unprimeable number, because it can be changed into a prime (331972661) 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, 612225 + ... + 612766.

It is an arithmetic number, because the mean of its divisors is an integer number (83299456).

Almost surely, 2^331972561 is an apocalyptic number.

It is an amenable number.

331972561 is a deficient number, since it is larger than the sum of its proper divisors (1225263).

331972561 is a wasteful number, since it uses less digits than its factorization.

331972561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225262.

The product of its digits is 34020, while the sum is 37.

The square root of 331972561 is about 18220.1141873480. The cubic root of 331972561 is about 692.4164806937.

The spelling of 331972561 in words is "three hundred thirty-one million, nine hundred seventy-two thousand, five hundred sixty-one".