291042064441 has 2 divisors, whose sum is σ = 291042064442. Its totient is φ = 291042064440.

The previous prime is 291042064399. The next prime is 291042064493. The reversal of 291042064441 is 144460240192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260920726416 + 30121338025 = 510804^2 + 173555^2 .

It is a cyclic number.

It is not a de Polignac number, because 291042064441 - 2²³ = 291033675833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 291042064441.

It is not a weakly prime, because it can be changed into another prime (291042067441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145521032220 + 145521032221.

It is an arithmetic number, because the mean of its divisors is an integer number (145521032221).

Almost surely, 2^291042064441 is an apocalyptic number.

It is an amenable number.

291042064441 is a deficient number, since it is larger than the sum of its proper divisors (1).

291042064441 is an equidigital number, since it uses as much as digits as its factorization.

291042064441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 291042064441 in words is "two hundred ninety-one billion, forty-two million, sixty-four thousand, four hundred forty-one".