617974813 has 4 divisors (see below), whose sum is σ = 618025180. Its totient is φ = 617924448.

The previous prime is 617974789. The next prime is 617974843. The reversal of 617974813 is 318479716.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 108930969 + 509043844 = 10437^2 + 22562^2 .

It is a cyclic number.

It is not a de Polignac number, because 617974813 - 2⁵ = 617974781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617974843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6553 + ... + 35761.

It is an arithmetic number, because the mean of its divisors is an integer number (154506295).

Almost surely, 2^617974813 is an apocalyptic number.

It is an amenable number.

617974813 is a deficient number, since it is larger than the sum of its proper divisors (50367).

617974813 is a wasteful number, since it uses less digits than its factorization.

617974813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50366.

The product of its digits is 254016, while the sum is 46.

The square root of 617974813 is about 24859.0991992872. The cubic root of 617974813 is about 851.7724550678.

The spelling of 617974813 in words is "six hundred seventeen million, nine hundred seventy-four thousand, eight hundred thirteen".