31400557 has 2 divisors, whose sum is σ = 31400558. Its totient is φ = 31400556.

The previous prime is 31400527. The next prime is 31400563. The reversal of 31400557 is 75500413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21846276 + 9554281 = 4674^2 + 3091^2 .

It is a cyclic number.

It is not a de Polignac number, because 31400557 - 2⁷ = 31400429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31400507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15700278 + 15700279.

It is an arithmetic number, because the mean of its divisors is an integer number (15700279).

Almost surely, 2^31400557 is an apocalyptic number.

It is an amenable number.

31400557 is a deficient number, since it is larger than the sum of its proper divisors (1).

31400557 is an equidigital number, since it uses as much as digits as its factorization.

31400557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 31400557 is about 5603.6199906846. The cubic root of 31400557 is about 315.4852921147.

The spelling of 31400557 in words is "thirty-one million, four hundred thousand, five hundred fifty-seven".