331902986 has 4 divisors (see below), whose sum is σ = 497854482. Its totient is φ = 165951492.

The previous prime is 331902947. The next prime is 331903003. The reversal of 331902986 is 689209133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689209133 = 73 ⋅9441221.

It can be written as a sum of positive squares in only one way, i.e., 325116961 + 6786025 = 18031^2 + 2605^2 .

It is a super-2 number, since 2×331902986² = 220319184231432392, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82975745 + ... + 82975748.

Almost surely, 2^331902986 is an apocalyptic number.

331902986 is a deficient number, since it is larger than the sum of its proper divisors (165951496).

331902986 is a wasteful number, since it uses less digits than its factorization.

331902986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165951495.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 331902986 is about 18218.2047963020. The cubic root of 331902986 is about 692.3681049661.

The spelling of 331902986 in words is "three hundred thirty-one million, nine hundred two thousand, nine hundred eighty-six".