618243631 has 2 divisors, whose sum is σ = 618243632. Its totient is φ = 618243630.

The previous prime is 618243623. The next prime is 618243653. The reversal of 618243631 is 136342816.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 618243631 - 2³ = 618243623 is a prime.

It is a super-2 number, since 2×618243631² = 764450374544128322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618243671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309121815 + 309121816.

It is an arithmetic number, because the mean of its divisors is an integer number (309121816).

Almost surely, 2^618243631 is an apocalyptic number.

618243631 is a deficient number, since it is larger than the sum of its proper divisors (1).

618243631 is an equidigital number, since it uses as much as digits as its factorization.

618243631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 618243631 is about 24864.5054445086. The cubic root of 618243631 is about 851.8959436902.

The spelling of 618243631 in words is "six hundred eighteen million, two hundred forty-three thousand, six hundred thirty-one".