655444591 has 2 divisors, whose sum is σ = 655444592. Its totient is φ = 655444590.

The previous prime is 655444541. The next prime is 655444613. The reversal of 655444591 is 195444556.

655444591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 655444591 - 2²¹ = 653347439 is a prime.

It is a super-2 number, since 2×655444591² = 859215223742314562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655444541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327722295 + 327722296.

It is an arithmetic number, because the mean of its divisors is an integer number (327722296).

Almost surely, 2^655444591 is an apocalyptic number.

655444591 is a deficient number, since it is larger than the sum of its proper divisors (1).

655444591 is an equidigital number, since it uses as much as digits as its factorization.

655444591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 43.

The square root of 655444591 is about 25601.6521146585. The cubic root of 655444591 is about 868.6510079845.

The spelling of 655444591 in words is "six hundred fifty-five million, four hundred forty-four thousand, five hundred ninety-one".