31661970 has 16 divisors (see below), whose sum is σ = 75988800. Its totient is φ = 8443184.

The previous prime is 31661957. The next prime is 31661983. The reversal of 31661970 is 7916613.

It is an interprime number because it is at equal distance from previous prime (31661957) and next prime (31661983).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527670 + ... + 527729.

It is an arithmetic number, because the mean of its divisors is an integer number (4749300).

Almost surely, 2^31661970 is an apocalyptic number.

31661970 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31661970 is an abundant number, since it is smaller than the sum of its proper divisors (44326830).

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

31661970 is a wasteful number, since it uses less digits than its factorization.

31661970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055409.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 31661970 is about 5626.8970134524. The cubic root of 31661970 is about 316.3583567412.

The spelling of 31661970 in words is "thirty-one million, six hundred sixty-one thousand, nine hundred seventy".