655086581 has 2 divisors, whose sum is σ = 655086582. Its totient is φ = 655086580.

The previous prime is 655086571. The next prime is 655086613. The reversal of 655086581 is 185680556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388287025 + 266799556 = 19705^2 + 16334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655086581 is a prime.

It is a super-2 number, since 2×655086581² = 858276857212539122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655086511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327543290 + 327543291.

It is an arithmetic number, because the mean of its divisors is an integer number (327543291).

Almost surely, 2^655086581 is an apocalyptic number.

It is an amenable number.

655086581 is a deficient number, since it is larger than the sum of its proper divisors (1).

655086581 is an equidigital number, since it uses as much as digits as its factorization.

655086581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288000, while the sum is 44.

The square root of 655086581 is about 25594.6592280499. The cubic root of 655086581 is about 868.4928240638.

The spelling of 655086581 in words is "six hundred fifty-five million, eighty-six thousand, five hundred eighty-one".