7181037081 has 27 divisors (see below), whose sum is σ = 10615661823. Its totient is φ = 4677703200.

The previous prime is 7181037047. The next prime is 7181037089. The reversal of 7181037081 is 1807301817.

The square root of 7181037081 is 84741.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6035891481 + 1145145600 = 77691^2 + 33840^2 .

It is not a de Polignac number, because 7181037081 - 2²⁵ = 7147482649 is a prime.

It is a super-2 number, since 2×7181037081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7181037089) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11948181 + ... + 11948781.

Almost surely, 2^7181037081 is an apocalyptic number.

7181037081 is the 84741-st square number.

7181037081 is the 42371-st centered octagonal number.

It is an amenable number.

7181037081 is a deficient number, since it is larger than the sum of its proper divisors (3434624742).

7181037081 is an frugal number, since it uses more digits than its factorization.

7181037081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 36.

The cubic root of 7181037081 is about 1929.2820475611.

Multiplying 7181037081 by its sum of digits (36), we get a square (258517334916 = 508446²).

Adding to 7181037081 its reverse (1807301817), we get a palindrome (8988338898).

The spelling of 7181037081 in words is "seven billion, one hundred eighty-one million, thirty-seven thousand, eighty-one".