71307691225 has 9 divisors (see below), whose sum is σ = 88423192767. Its totient is φ = 57045084840.

The previous prime is 71307691211. The next prime is 71307691253. The reversal of 71307691225 is 52219670317.

The square root of 71307691225 is 267035.

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., 25670768841 + 45636922384 = 160221^2 + 213628^2 .

It is not a de Polignac number, because 71307691225 - 2¹³ = 71307683033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1308472 + ... + 1361878.

Almost surely, 2^71307691225 is an apocalyptic number.

71307691225 is the 267035-th square number.

71307691225 is the 133518-th centered octagonal number.

It is an amenable number.

71307691225 is a deficient number, since it is larger than the sum of its proper divisors (17115501542).

71307691225 is an frugal number, since it uses more digits than its factorization.

71307691225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106824 (or 53412 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 43.

The spelling of 71307691225 in words is "seventy-one billion, three hundred seven million, six hundred ninety-one thousand, two hundred twenty-five".