31381308 has 36 divisors (see below), whose sum is σ = 90657840. Its totient is φ = 8966016.

The previous prime is 31381307. The next prime is 31381349. The reversal of 31381308 is 80318313.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31381307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62013 + ... + 62516.

Almost surely, 2^31381308 is an apocalyptic number.

It is an amenable number.

31381308 is an abundant number, since it is smaller than the sum of its proper divisors (59276532).

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

31381308 is a wasteful number, since it uses less digits than its factorization.

31381308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124546 (or 124541 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 31381308 is about 5601.9021769395. The cubic root of 31381308 is about 315.4208132403.

The spelling of 31381308 in words is "thirty-one million, three hundred eighty-one thousand, three hundred eight".