31661958 has 16 divisors (see below), whose sum is σ = 63426096. Its totient is φ = 10536960.

The previous prime is 31661957. The next prime is 31661983. The reversal of 31661958 is 85916613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118 + ... + 7958.

It is an arithmetic number, because the mean of its divisors is an integer number (3964131).

Almost surely, 2^31661958 is an apocalyptic number.

31661958 is an abundant number, since it is smaller than the sum of its proper divisors (31764138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31661958 is a wasteful number, since it uses less digits than its factorization.

31661958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8519.

The product of its digits is 38880, while the sum is 39.

The square root of 31661958 is about 5626.8959471453. The cubic root of 31661958 is about 316.3583167742.

The spelling of 31661958 in words is "thirty-one million, six hundred sixty-one thousand, nine hundred fifty-eight".