31121963 has 2 divisors, whose sum is σ = 31121964. Its totient is φ = 31121962.

The previous prime is 31121957. The next prime is 31121977. The reversal of 31121963 is 36912113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31121963 - 2⁶ = 31121899 is a prime.

It is not a weakly prime, because it can be changed into another prime (31121983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560981 + 15560982.

It is an arithmetic number, because the mean of its divisors is an integer number (15560982).

Almost surely, 2^31121963 is an apocalyptic number.

31121963 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121963 is an equidigital number, since it uses as much as digits as its factorization.

31121963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 26.

The square root of 31121963 is about 5578.7062120173. The cubic root of 31121963 is about 314.5494962636.

The spelling of 31121963 in words is "thirty-one million, one hundred twenty-one thousand, nine hundred sixty-three".