31661412 has 24 divisors (see below), whose sum is σ = 78222816. Its totient is φ = 9932928.

The previous prime is 31661401. The next prime is 31661419. The reversal of 31661412 is 21416613.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (31661419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77398 + ... + 77805.

It is an arithmetic number, because the mean of its divisors is an integer number (3259284).

Almost surely, 2^31661412 is an apocalyptic number.

It is an amenable number.

31661412 is an abundant number, since it is smaller than the sum of its proper divisors (46561404).

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

31661412 is a wasteful number, since it uses less digits than its factorization.

31661412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155227 (or 155225 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 31661412 is about 5626.8474299558. The cubic root of 31661412 is about 316.3564982655.

The spelling of 31661412 in words is "thirty-one million, six hundred sixty-one thousand, four hundred twelve".