291544961 has 2 divisors, whose sum is σ = 291544962. Its totient is φ = 291544960.

The previous prime is 291544931. The next prime is 291544969. The reversal of 291544961 is 169445192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251412736 + 40132225 = 15856^2 + 6335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291544961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (291544969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145772480 + 145772481.

It is an arithmetic number, because the mean of its divisors is an integer number (145772481).

Almost surely, 2^291544961 is an apocalyptic number.

It is an amenable number.

291544961 is a deficient number, since it is larger than the sum of its proper divisors (1).

291544961 is an equidigital number, since it uses as much as digits as its factorization.

291544961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The square root of 291544961 is about 17074.6877277448. The cubic root of 291544961 is about 663.0839458523.

The spelling of 291544961 in words is "two hundred ninety-one million, five hundred forty-four thousand, nine hundred sixty-one".