861614591 has 2 divisors, whose sum is σ = 861614592. Its totient is φ = 861614590.

The previous prime is 861614581. The next prime is 861614599. The reversal of 861614591 is 195416168.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861614591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861614599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430807295 + 430807296.

It is an arithmetic number, because the mean of its divisors is an integer number (430807296).

Almost surely, 2^861614591 is an apocalyptic number.

861614591 is a deficient number, since it is larger than the sum of its proper divisors (1).

861614591 is an equidigital number, since it uses as much as digits as its factorization.

861614591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 861614591 is about 29353.2722366689. The cubic root of 861614591 is about 951.5632953228.

The spelling of 861614591 in words is "eight hundred sixty-one million, six hundred fourteen thousand, five hundred ninety-one".