6318991 has 6 divisors (see below), whose sum is σ = 7350720. Its totient is φ = 5416236.

The previous prime is 6318989. The next prime is 6319003. The reversal of 6318991 is 1998136.

It is not a de Polignac number, because 6318991 - 2¹ = 6318989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6318991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6318901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64431 + ... + 64528.

It is an arithmetic number, because the mean of its divisors is an integer number (1225120).

Almost surely, 2^6318991 is an apocalyptic number.

6318991 is a deficient number, since it is larger than the sum of its proper divisors (1031729).

6318991 is a wasteful number, since it uses less digits than its factorization.

6318991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128973 (or 128966 counting only the distinct ones).

The product of its digits is 11664, while the sum is 37.

The square root of 6318991 is about 2513.7603306600. The cubic root of 6318991 is about 184.8768696125.

It can be divided in two parts, 6 and 318991, that multiplied together give a triangular number (1913946 = T₁₉₅₆).

The spelling of 6318991 in words is "six million, three hundred eighteen thousand, nine hundred ninety-one".