31058561 has 2 divisors, whose sum is σ = 31058562. Its totient is φ = 31058560.

The previous prime is 31058551. The next prime is 31058563. The reversal of 31058561 is 16585013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22619536 + 8439025 = 4756^2 + 2905^2 .

It is a cyclic number.

It is not a de Polignac number, because 31058561 - 2¹⁴ = 31042177 is a prime.

It is a super-2 number, since 2×31058561² = 1929268422781442, which contains 22 as substring.

Together with 31058563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31058563) 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, 15529280 + 15529281.

It is an arithmetic number, because the mean of its divisors is an integer number (15529281).

Almost surely, 2^31058561 is an apocalyptic number.

It is an amenable number.

31058561 is a deficient number, since it is larger than the sum of its proper divisors (1).

31058561 is an equidigital number, since it uses as much as digits as its factorization.

31058561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 31058561 is about 5573.0208146032. The cubic root of 31058561 is about 314.3357498358.

The spelling of 31058561 in words is "thirty-one million, fifty-eight thousand, five hundred sixty-one".