7118138531 has 16 divisors (see below), whose sum is σ = 8289742848. Its totient is φ = 5986094400.

The previous prime is 7118138497. The next prime is 7118138543. The reversal of 7118138531 is 1358318117.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7118138531 is a prime.

It is a super-2 number, since 2×7118138531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7118188531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61136 + ... + 134066.

It is an arithmetic number, because the mean of its divisors is an integer number (518108928).

Almost surely, 2^7118138531 is an apocalyptic number.

7118138531 is a deficient number, since it is larger than the sum of its proper divisors (1171604317).

7118138531 is a wasteful number, since it uses less digits than its factorization.

7118138531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73202.

The product of its digits is 20160, while the sum is 38.

The square root of 7118138531 is about 84369.0614561997. The cubic root of 7118138531 is about 1923.6326743563.

The spelling of 7118138531 in words is "seven billion, one hundred eighteen million, one hundred thirty-eight thousand, five hundred thirty-one".