31681032 has 32 divisors (see below), whose sum is σ = 79444800. Its totient is φ = 10528064.

The previous prime is 31681007. The next prime is 31681043. The reversal of 31681032 is 23018613.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 31680993 and 31681011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6778 + ... + 10454.

It is an arithmetic number, because the mean of its divisors is an integer number (2482650).

Almost surely, 2^31681032 is an apocalyptic number.

It is an amenable number.

31681032 is an abundant number, since it is smaller than the sum of its proper divisors (47763768).

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

31681032 is a wasteful number, since it uses less digits than its factorization.

31681032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4045 (or 4041 counting only the distinct ones).

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

The square root of 31681032 is about 5628.5905873496. The cubic root of 31681032 is about 316.4218315576.

Adding to 31681032 its reverse (23018613), we get a palindrome (54699645).

The spelling of 31681032 in words is "thirty-one million, six hundred eighty-one thousand, thirty-two".