7158981 has 8 divisors (see below), whose sum is σ = 9640224. Its totient is φ = 4725200.

The previous prime is 7158973. The next prime is 7158997. The reversal of 7158981 is 1898517.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7158981 - 2³ = 7158973 is a prime.

It is a super-2 number, since 2×7158981² = 102502017916722, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7158961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11511 + ... + 12116.

It is an arithmetic number, because the mean of its divisors is an integer number (1205028).

Almost surely, 2^7158981 is an apocalyptic number.

It is an amenable number.

7158981 is a deficient number, since it is larger than the sum of its proper divisors (2481243).

7158981 is a wasteful number, since it uses less digits than its factorization.

7158981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23731.

The product of its digits is 20160, while the sum is 39.

The square root of 7158981 is about 2675.6272161869. The cubic root of 7158981 is about 192.7304801064.

The spelling of 7158981 in words is "seven million, one hundred fifty-eight thousand, nine hundred eighty-one".