618685431 has 16 divisors (see below), whose sum is σ = 1015279104. Its totient is φ = 326339424.

The previous prime is 618685427. The next prime is 618685433. The reversal of 618685431 is 134586816.

It is not a de Polignac number, because 618685431 - 2² = 618685427 is a prime.

It is a super-2 number, since 2×618685431² = 765543325063311522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618685433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1132851 + ... + 1133396.

It is an arithmetic number, because the mean of its divisors is an integer number (63454944).

Almost surely, 2^618685431 is an apocalyptic number.

618685431 is a deficient number, since it is larger than the sum of its proper divisors (396593673).

618685431 is a wasteful number, since it uses less digits than its factorization.

618685431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266270.

The product of its digits is 138240, while the sum is 42.

The square root of 618685431 is about 24873.3880080700. The cubic root of 618685431 is about 852.0988184110.

The spelling of 618685431 in words is "six hundred eighteen million, six hundred eighty-five thousand, four hundred thirty-one".