31465561 has 2 divisors, whose sum is σ = 31465562. Its totient is φ = 31465560.

The previous prime is 31465547. The next prime is 31465571. The reversal of 31465561 is 16556413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 8088336 = 4835^2 + 2844^2 .

It is a cyclic number.

It is not a de Polignac number, because 31465561 - 2⁵ = 31465529 is a prime.

It is equal to p_1942861 and since 31465561 and 1942861 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31465571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15732780 + 15732781.

It is an arithmetic number, because the mean of its divisors is an integer number (15732781).

Almost surely, 2^31465561 is an apocalyptic number.

It is an amenable number.

31465561 is a deficient number, since it is larger than the sum of its proper divisors (1).

31465561 is an equidigital number, since it uses as much as digits as its factorization.

31465561 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 31465561 is about 5609.4171711507. The cubic root of 31465561 is about 315.7028431467.

The spelling of 31465561 in words is "thirty-one million, four hundred sixty-five thousand, five hundred sixty-one".