31681036 has 6 divisors (see below), whose sum is σ = 55441820. Its totient is φ = 15840516.

The previous prime is 31681007. The next prime is 31681043. The reversal of 31681036 is 63018613.

It is a junction number, because it is equal to n+sod(n) for n = 31680995 and 31681013.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3960126 + ... + 3960133.

Almost surely, 2^31681036 is an apocalyptic number.

It is an amenable number.

31681036 is a deficient number, since it is larger than the sum of its proper divisors (23760784).

31681036 is a wasteful number, since it uses less digits than its factorization.

31681036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7920263 (or 7920261 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 31681036 is about 5628.5909426783. The cubic root of 31681036 is about 316.4218448746.

Adding to 31681036 its reverse (63018613), we get a palindrome (94699649).

The spelling of 31681036 in words is "thirty-one million, six hundred eighty-one thousand, thirty-six".