613997287 has 2 divisors, whose sum is σ = 613997288. Its totient is φ = 613997286.

The previous prime is 613997261. The next prime is 613997303. The reversal of 613997287 is 782799316.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-613997287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (613997227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306998643 + 306998644.

It is an arithmetic number, because the mean of its divisors is an integer number (306998644).

Almost surely, 2^613997287 is an apocalyptic number.

613997287 is a deficient number, since it is larger than the sum of its proper divisors (1).

613997287 is an equidigital number, since it uses as much as digits as its factorization.

613997287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 52.

The square root of 613997287 is about 24778.9686427825. The cubic root of 613997287 is about 849.9410741158.

It can be divided in two parts, 61399 and 7287, that added together give a palindrome (68686).

The spelling of 613997287 in words is "six hundred thirteen million, nine hundred ninety-seven thousand, two hundred eighty-seven".