31556461 has 2 divisors, whose sum is σ = 31556462. Its totient is φ = 31556460.

The previous prime is 31556423. The next prime is 31556467. The reversal of 31556461 is 16465513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 5851561 = 5070^2 + 2419^2 .

It is an emirp because it is prime and its reverse (16465513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31556461 - 2⁹ = 31555949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31556467) 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 as a sum of consecutive naturals, namely, 15778230 + 15778231.

It is an arithmetic number, because the mean of its divisors is an integer number (15778231).

Almost surely, 2^31556461 is an apocalyptic number.

It is an amenable number.

31556461 is a deficient number, since it is larger than the sum of its proper divisors (1).

31556461 is an equidigital number, since it uses as much as digits as its factorization.

31556461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 31556461 is about 5617.5137739039. The cubic root of 31556461 is about 316.0065593094.

The spelling of 31556461 in words is "thirty-one million, five hundred fifty-six thousand, four hundred sixty-one".