618310391 has 4 divisors (see below), whose sum is σ = 621240984. Its totient is φ = 615379800.

The previous prime is 618310379. The next prime is 618310393. The reversal of 618310391 is 193013816.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 618310391 - 2¹⁸ = 618048247 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 (618310393) 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, 1464980 + ... + 1465401.

It is an arithmetic number, because the mean of its divisors is an integer number (155310246).

Almost surely, 2^618310391 is an apocalyptic number.

618310391 is a deficient number, since it is larger than the sum of its proper divisors (2930593).

618310391 is a wasteful number, since it uses less digits than its factorization.

618310391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930592.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 618310391 is about 24865.8478841965. The cubic root of 618310391 is about 851.9266061041.

The spelling of 618310391 in words is "six hundred eighteen million, three hundred ten thousand, three hundred ninety-one".