31363561 has 2 divisors, whose sum is σ = 31363562. Its totient is φ = 31363560.

The previous prime is 31363481. The next prime is 31363567. The reversal of 31363561 is 16536313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31304025 + 59536 = 5595^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 31363561 - 2⁹ = 31363049 is a prime.

It is not a weakly prime, because it can be changed into another prime (31363567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15681780 + 15681781.

It is an arithmetic number, because the mean of its divisors is an integer number (15681781).

Almost surely, 2^31363561 is an apocalyptic number.

It is an amenable number.

31363561 is a deficient number, since it is larger than the sum of its proper divisors (1).

31363561 is an equidigital number, since it uses as much as digits as its factorization.

31363561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 28.

The square root of 31363561 is about 5600.3179374032. The cubic root of 31363561 is about 315.3613422888.

Adding to 31363561 its reverse (16536313), we get a palindrome (47899874).

The spelling of 31363561 in words is "thirty-one million, three hundred sixty-three thousand, five hundred sixty-one".