31220963 has 2 divisors, whose sum is σ = 31220964. Its totient is φ = 31220962.

The previous prime is 31220953. The next prime is 31220977. The reversal of 31220963 is 36902213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31220963 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31220923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610481 + 15610482.

It is an arithmetic number, because the mean of its divisors is an integer number (15610482).

Almost surely, 2^31220963 is an apocalyptic number.

31220963 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220963 is an equidigital number, since it uses as much as digits as its factorization.

31220963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 31220963 is about 5587.5721919274. The cubic root of 31220963 is about 314.8826740349.

It can be divided in two parts, 312 and 20963, that multiplied together give a palindrome (6540456).

The spelling of 31220963 in words is "thirty-one million, two hundred twenty thousand, nine hundred sixty-three".