331618861 has 4 divisors (see below), whose sum is σ = 378992992. Its totient is φ = 284244732.

The previous prime is 331618849. The next prime is 331618871. The reversal of 331618861 is 168816133.

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: 168816133 = 439 ⋅384547.

It is a cyclic number.

It is not a de Polignac number, because 331618861 - 2⁹ = 331618349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 331618861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331618831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23687055 + ... + 23687068.

It is an arithmetic number, because the mean of its divisors is an integer number (94748248).

Almost surely, 2^331618861 is an apocalyptic number.

It is an amenable number.

331618861 is a deficient number, since it is larger than the sum of its proper divisors (47374131).

331618861 is an equidigital number, since it uses as much as digits as its factorization.

331618861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47374130.

The product of its digits is 20736, while the sum is 37.

The square root of 331618861 is about 18210.4052947758. The cubic root of 331618861 is about 692.1704817082.

The spelling of 331618861 in words is "three hundred thirty-one million, six hundred eighteen thousand, eight hundred sixty-one".