31694144 has 14 divisors (see below), whose sum is σ = 62893194. Its totient is φ = 15847040.

The previous prime is 31694141. The next prime is 31694153. The reversal of 31694144 is 44149613.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19360000 + 12334144 = 4400^2 + 3512^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 31694144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31694141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247547 + ... + 247674.

It is an arithmetic number, because the mean of its divisors is an integer number (4492371).

Almost surely, 2^31694144 is an apocalyptic number.

It is an amenable number.

31694144 is a deficient number, since it is larger than the sum of its proper divisors (31199050).

31694144 is an equidigital number, since it uses as much as digits as its factorization.

31694144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495233 (or 495223 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 31694144 is about 5629.7552344662. The cubic root of 31694144 is about 316.4654786081.

The spelling of 31694144 in words is "thirty-one million, six hundred ninety-four thousand, one hundred forty-four".