31381192 has 32 divisors (see below), whose sum is σ = 60318720. Its totient is φ = 15301440.

The previous prime is 31381187. The next prime is 31381199. The reversal of 31381192 is 29118313.

It is a super-2 number, since 2×31381192² = 1969558422681728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31381192.

It is not an unprimeable number, because it can be changed into a prime (31381199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67842 + ... + 68302.

It is an arithmetic number, because the mean of its divisors is an integer number (1884960).

Almost surely, 2^31381192 is an apocalyptic number.

It is an amenable number.

31381192 is a deficient number, since it is larger than the sum of its proper divisors (28937528).

31381192 is a wasteful number, since it uses less digits than its factorization.

31381192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661 (or 657 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 31381192 is about 5601.8918233040. The cubic root of 31381192 is about 315.4204245922.

The spelling of 31381192 in words is "thirty-one million, three hundred eighty-one thousand, one hundred ninety-two".