7131295809 has 45 divisors (see below), whose sum is σ = 11723155059. Its totient is φ = 4316930640.

The previous prime is 7131295753. The next prime is 7131295811. The reversal of 7131295809 is 9085921317.

The square root of 7131295809 is 84447.

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., 411887025 + 6719408784 = 20295^2 + 81972^2 .

It is not a de Polignac number, because 7131295809 - 2¹⁷ = 7131164737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7131295819) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 8359827 + ... + 8360679.

Almost surely, 2^7131295809 is an apocalyptic number.

7131295809 is the 84447-th square number.

7131295809 is the 42224-th centered octagonal number.

It is an amenable number.

7131295809 is a deficient number, since it is larger than the sum of its proper divisors (4591859250).

7131295809 is an frugal number, since it uses more digits than its factorization.

7131295809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The cubic root of 7131295809 is about 1924.8171690303.

The spelling of 7131295809 in words is "seven billion, one hundred thirty-one million, two hundred ninety-five thousand, eight hundred nine".