31080156 has 12 divisors (see below), whose sum is σ = 72520392. Its totient is φ = 10360048.

The previous prime is 31080139. The next prime is 31080157. The reversal of 31080156 is 65108013.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31080157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294995 + ... + 1295018.

It is an arithmetic number, because the mean of its divisors is an integer number (6043366).

Almost surely, 2^31080156 is an apocalyptic number.

It is an amenable number.

31080156 is an abundant number, since it is smaller than the sum of its proper divisors (41440236).

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

31080156 is a wasteful number, since it uses less digits than its factorization.

31080156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590020 (or 2590018 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 31080156 is about 5574.9579370611. The cubic root of 31080156 is about 314.4085854476.

Adding to 31080156 its reverse (65108013), we get a palindrome (96188169).

The spelling of 31080156 in words is "thirty-one million, eighty thousand, one hundred fifty-six".