655515013 has 2 divisors, whose sum is σ = 655515014. Its totient is φ = 655515012.

The previous prime is 655515001. The next prime is 655515023. The reversal of 655515013 is 310515556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 355775044 + 299739969 = 18862^2 + 17313^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655515013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655515023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327757506 + 327757507.

It is an arithmetic number, because the mean of its divisors is an integer number (327757507).

Almost surely, 2^655515013 is an apocalyptic number.

It is an amenable number.

655515013 is a deficient number, since it is larger than the sum of its proper divisors (1).

655515013 is an equidigital number, since it uses as much as digits as its factorization.

655515013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 31.

The square root of 655515013 is about 25603.0274186472. The cubic root of 655515013 is about 868.6821166149.

The spelling of 655515013 in words is "six hundred fifty-five million, five hundred fifteen thousand, thirteen".