656240513 has 2 divisors, whose sum is σ = 656240514. Its totient is φ = 656240512.

The previous prime is 656240503. The next prime is 656240537. The reversal of 656240513 is 315042656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 647549809 + 8690704 = 25447^2 + 2948^2 .

It is a cyclic number.

It is not a de Polignac number, because 656240513 - 2¹⁰ = 656239489 is a prime.

It is a super-2 number, since 2×656240513² = 861303221805006338, which contains 22 as substring.

It is equal to p_34100897 and since 656240513 and 34100897 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656240513.

It is not a weakly prime, because it can be changed into another prime (656240503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328120256 + 328120257.

It is an arithmetic number, because the mean of its divisors is an integer number (328120257).

Almost surely, 2^656240513 is an apocalyptic number.

It is an amenable number.

656240513 is a deficient number, since it is larger than the sum of its proper divisors (1).

656240513 is an equidigital number, since it uses as much as digits as its factorization.

656240513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 656240513 is about 25617.1917469499. The cubic root of 656240513 is about 869.0024736377.

The spelling of 656240513 in words is "six hundred fifty-six million, two hundred forty thousand, five hundred thirteen".