3191620961 has 2 divisors, whose sum is σ = 3191620962. Its totient is φ = 3191620960.

The previous prime is 3191620951. The next prime is 3191620979. The reversal of 3191620961 is 1690261913.

3191620961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1758544225 + 1433076736 = 41935^2 + 37856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3191620961 is a prime.

It is not a weakly prime, because it can be changed into another prime (3191620951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1595810480 + 1595810481.

It is an arithmetic number, because the mean of its divisors is an integer number (1595810481).

Almost surely, 2^3191620961 is an apocalyptic number.

It is an amenable number.

3191620961 is a deficient number, since it is larger than the sum of its proper divisors (1).

3191620961 is an equidigital number, since it uses as much as digits as its factorization.

3191620961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 3191620961 is about 56494.4330089258. The cubic root of 3191620961 is about 1472.3252817258.

The spelling of 3191620961 in words is "three billion, one hundred ninety-one million, six hundred twenty thousand, nine hundred sixty-one".