31350961 has 2 divisors, whose sum is σ = 31350962. Its totient is φ = 31350960.

The previous prime is 31350959. The next prime is 31350971. The reversal of 31350961 is 16905313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21390625 + 9960336 = 4625^2 + 3156^2 .

It is a cyclic number.

It is not a de Polignac number, because 31350961 - 2¹ = 31350959 is a prime.

Together with 31350959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31350911) 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, 15675480 + 15675481.

It is an arithmetic number, because the mean of its divisors is an integer number (15675481).

Almost surely, 2^31350961 is an apocalyptic number.

It is an amenable number.

31350961 is a deficient number, since it is larger than the sum of its proper divisors (1).

31350961 is an equidigital number, since it uses as much as digits as its factorization.

31350961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 31350961 is about 5599.1928882652. The cubic root of 31350961 is about 315.3191055336.

The spelling of 31350961 in words is "thirty-one million, three hundred fifty thousand, nine hundred sixty-one".