31359961 has 2 divisors, whose sum is σ = 31359962. Its totient is φ = 31359960.

The previous prime is 31359949. The next prime is 31359967. The reversal of 31359961 is 16995313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28686736 + 2673225 = 5356^2 + 1635^2 .

It is a cyclic number.

It is not a de Polignac number, because 31359961 - 2¹⁵ = 31327193 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31359961.

It is not a weakly prime, because it can be changed into another prime (31359967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15679980 + 15679981.

It is an arithmetic number, because the mean of its divisors is an integer number (15679981).

Almost surely, 2^31359961 is an apocalyptic number.

It is an amenable number.

31359961 is a deficient number, since it is larger than the sum of its proper divisors (1).

31359961 is an equidigital number, since it uses as much as digits as its factorization.

31359961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21870, while the sum is 37.

The square root of 31359961 is about 5599.9965178561. The cubic root of 31359961 is about 315.3492757990.

The spelling of 31359961 in words is "thirty-one million, three hundred fifty-nine thousand, nine hundred sixty-one".