331606651 has 4 divisors (see below), whose sum is σ = 336556072. Its totient is φ = 326657232.

The previous prime is 331606643. The next prime is 331606657. The reversal of 331606651 is 156606133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156606133 = 1093 ⋅143281.

It is a cyclic number.

It is not a de Polignac number, because 331606651 - 2³ = 331606643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331606657) 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, 2474610 + ... + 2474743.

It is an arithmetic number, because the mean of its divisors is an integer number (84139018).

Almost surely, 2^331606651 is an apocalyptic number.

331606651 is a deficient number, since it is larger than the sum of its proper divisors (4949421).

331606651 is an equidigital number, since it uses as much as digits as its factorization.

331606651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4949420.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 331606651 is about 18210.0700437972. The cubic root of 331606651 is about 692.1619865085.

The spelling of 331606651 in words is "three hundred thirty-one million, six hundred six thousand, six hundred fifty-one".