31661444 has 6 divisors (see below), whose sum is σ = 55407534. Its totient is φ = 15830720.

The previous prime is 31661437. The next prime is 31661473. The reversal of 31661444 is 44416613.

It can be written as a sum of positive squares in only one way, i.e., 29593600 + 2067844 = 5440^2 + 1438^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3957677 + ... + 3957684.

It is an arithmetic number, because the mean of its divisors is an integer number (9234589).

Almost surely, 2^31661444 is an apocalyptic number.

It is an amenable number.

31661444 is a deficient number, since it is larger than the sum of its proper divisors (23746090).

31661444 is a wasteful number, since it uses less digits than its factorization.

31661444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7915365 (or 7915363 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 31661444 is about 5626.8502734656. The cubic root of 31661444 is about 316.3566048454.

The spelling of 31661444 in words is "thirty-one million, six hundred sixty-one thousand, four hundred forty-four".