31380057 has 12 divisors (see below), whose sum is σ = 45379620. Its totient is φ = 20895648.

The previous prime is 31380031. The next prime is 31380101. The reversal of 31380057 is 75008313.

It can be written as a sum of positive squares in 2 ways, for example, as 16818201 + 14561856 = 4101^2 + 3816^2 .

It is not a de Polignac number, because 31380057 - 2¹² = 31375961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31380057.

It is not an unprimeable number, because it can be changed into a prime (31380017) 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, 9643 + ... + 12479.

It is an arithmetic number, because the mean of its divisors is an integer number (3781635).

Almost surely, 2^31380057 is an apocalyptic number.

It is an amenable number.

31380057 is a deficient number, since it is larger than the sum of its proper divisors (13999563).

31380057 is a wasteful number, since it uses less digits than its factorization.

31380057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4072 (or 4069 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 31380057 is about 5601.7905173257. The cubic root of 31380057 is about 315.4166218208.

The spelling of 31380057 in words is "thirty-one million, three hundred eighty thousand, fifty-seven".