31400137 has 4 divisors (see below), whose sum is σ = 32166036. Its totient is φ = 30634240.

The previous prime is 31400123. The next prime is 31400143. The reversal of 31400137 is 73100413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2627641 + 28772496 = 1621^2 + 5364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31400137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31400167) 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 3 ways as a sum of consecutive naturals, for example, 382888 + ... + 382969.

It is an arithmetic number, because the mean of its divisors is an integer number (8041509).

Almost surely, 2^31400137 is an apocalyptic number.

It is an amenable number.

31400137 is a deficient number, since it is larger than the sum of its proper divisors (765899).

31400137 is an equidigital number, since it uses as much as digits as its factorization.

31400137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765898.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 31400137 is about 5603.5825147846. The cubic root of 31400137 is about 315.4838855110.

The spelling of 31400137 in words is "thirty-one million, four hundred thousand, one hundred thirty-seven".