31971902 has 8 divisors (see below), whose sum is σ = 48000000. Its totient is φ = 15971904.

The previous prime is 31971887. The next prime is 31971911. The reversal of 31971902 is 20917913.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3902 + ... + 8897.

It is an arithmetic number, because the mean of its divisors is an integer number (6000000).

Almost surely, 2^31971902 is an apocalyptic number.

31971902 is a deficient number, since it is larger than the sum of its proper divisors (16028098).

31971902 is a wasteful number, since it uses less digits than its factorization.

31971902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14050.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 31971902 is about 5654.3701682858. The cubic root of 31971902 is about 317.3872606940.

The spelling of 31971902 in words is "thirty-one million, nine hundred seventy-one thousand, nine hundred two".