331042987 has 4 divisors (see below), whose sum is σ = 361137816. Its totient is φ = 300948160.

The previous prime is 331042981. The next prime is 331042991. The reversal of 331042987 is 789240133.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 331042987 - 2²⁷ = 196825259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331042981) 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, 15047398 + ... + 15047419.

It is an arithmetic number, because the mean of its divisors is an integer number (90284454).

Almost surely, 2^331042987 is an apocalyptic number.

331042987 is a deficient number, since it is larger than the sum of its proper divisors (30094829).

331042987 is a wasteful number, since it uses less digits than its factorization.

331042987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30094828.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 331042987 is about 18194.5867499100. The cubic root of 331042987 is about 691.7695857947.

The spelling of 331042987 in words is "three hundred thirty-one million, forty-two thousand, nine hundred eighty-seven".