613256491 has 2 divisors, whose sum is σ = 613256492. Its totient is φ = 613256490.

The previous prime is 613256459. The next prime is 613256543. The reversal of 613256491 is 194652316.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 613256491 - 2⁵ = 613256459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 613256491.

It is not a weakly prime, because it can be changed into another prime (613256431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306628245 + 306628246.

It is an arithmetic number, because the mean of its divisors is an integer number (306628246).

Almost surely, 2^613256491 is an apocalyptic number.

613256491 is a deficient number, since it is larger than the sum of its proper divisors (1).

613256491 is an equidigital number, since it uses as much as digits as its factorization.

613256491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 613256491 is about 24764.0160515212. The cubic root of 613256491 is about 849.5991147666.

The spelling of 613256491 in words is "six hundred thirteen million, two hundred fifty-six thousand, four hundred ninety-one".