31690116 has 36 divisors (see below), whose sum is σ = 83074992. Its totient is φ = 10563048.

The previous prime is 31690111. The next prime is 31690121. The reversal of 31690116 is 61109613.

It is an interprime number because it is at equal distance from previous prime (31690111) and next prime (31690121).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 31690116.

It is not an unprimeable number, because it can be changed into a prime (31690111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15330 + ... + 17273.

Almost surely, 2^31690116 is an apocalyptic number.

31690116 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31690116 is an abundant number, since it is smaller than the sum of its proper divisors (51384876).

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

31690116 is a wasteful number, since it uses less digits than its factorization.

31690116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32622 (or 32608 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 31690116 is about 5629.3974810809. The cubic root of 31690116 is about 316.4520715367.

Adding to 31690116 its reverse (61109613), we get a palindrome (92799729).

The spelling of 31690116 in words is "thirty-one million, six hundred ninety thousand, one hundred sixteen".