618431913 has 12 divisors (see below), whose sum is σ = 974498928. Its totient is φ = 374807160.

The previous prime is 618431903. The next prime is 618431917. The reversal of 618431913 is 319134816.

618431913 is a `hidden beast` number, since 618 + 4 + 31 + 9 + 1 + 3 = 666.

It is not a de Polignac number, because 618431913 - 2⁸ = 618431657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (618431917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3123295 + ... + 3123492.

It is an arithmetic number, because the mean of its divisors is an integer number (81208244).

Almost surely, 2^618431913 is an apocalyptic number.

It is an amenable number.

618431913 is a deficient number, since it is larger than the sum of its proper divisors (356067015).

618431913 is a wasteful number, since it uses less digits than its factorization.

618431913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6246804 (or 6246801 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 618431913 is about 24868.2913164536. The cubic root of 618431913 is about 851.9824146671.

The spelling of 618431913 in words is "six hundred eighteen million, four hundred thirty-one thousand, nine hundred thirteen".