31131190 has 16 divisors (see below), whose sum is σ = 58472928. Its totient is φ = 11910976.

The previous prime is 31131187. The next prime is 31131197. The reversal of 31131190 is 9113113.

It is a happy number.

It is a super-2 number, since 2×31131190² = 1938301981632200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67447 + ... + 67906.

It is an arithmetic number, because the mean of its divisors is an integer number (3654558).

Almost surely, 2^31131190 is an apocalyptic number.

31131190 is a deficient number, since it is larger than the sum of its proper divisors (27341738).

31131190 is a wasteful number, since it uses less digits than its factorization.

31131190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135383.

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 31131190 is about 5579.5331345911. The cubic root of 31131190 is about 314.5805789368.

The spelling of 31131190 in words is "thirty-one million, one hundred thirty-one thousand, one hundred ninety".