7318981 has 4 divisors (see below), whose sum is σ = 7474752. Its totient is φ = 7163212.

The previous prime is 7318979. The next prime is 7319003. The reversal of 7318981 is 1898137.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7318981 - 2¹ = 7318979 is a prime.

It is a super-2 number, since 2×7318981² = 107134965756722, which contains 22 as substring.

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 7318981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7318921) 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, 77815 + ... + 77908.

It is an arithmetic number, because the mean of its divisors is an integer number (1868688).

Almost surely, 2^7318981 is an apocalyptic number.

It is an amenable number.

7318981 is a deficient number, since it is larger than the sum of its proper divisors (155771).

7318981 is a wasteful number, since it uses less digits than its factorization.

7318981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155770.

The product of its digits is 12096, while the sum is 37.

The square root of 7318981 is about 2705.3615285207. The cubic root of 7318981 is about 194.1557275136.

The spelling of 7318981 in words is "seven million, three hundred eighteen thousand, nine hundred eighty-one".