91757497225 has 27 divisors (see below), whose sum is σ = 116341897237. Its totient is φ = 71788431680.

The previous prime is 91757497213. The next prime is 91757497261. The reversal of 91757497225 is 52279475719.

The square root of 91757497225 is 302915.

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

It can be written as a sum of positive squares in 4 ways, for example, as 3413013241 + 88344483984 = 58421^2 + 297228^2 .

It is not a de Polignac number, because 91757497225 - 2⁵ = 91757497193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91757497225.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 71184381 + ... + 71185669.

Almost surely, 2^91757497225 is an apocalyptic number.

91757497225 is the 302915-th square number.

91757497225 is the 151458-th centered octagonal number.

It is an amenable number.

91757497225 is a deficient number, since it is larger than the sum of its proper divisors (24584400012).

91757497225 is an frugal number, since it uses more digits than its factorization.

91757497225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682 (or 1341 counting only the distinct ones).

The product of its digits is 11113200, while the sum is 58.

The spelling of 91757497225 in words is "ninety-one billion, seven hundred fifty-seven million, four hundred ninety-seven thousand, two hundred twenty-five".