97915797225 has 81 divisors (see below), whose sum is σ = 183537089463. Its totient is φ = 49896174240.

The previous prime is 97915797211. The next prime is 97915797251. The reversal of 97915797225 is 52279751979.

The square root of 97915797225 is 312915.

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., 35249687001 + 62666110224 = 187749^2 + 250332^2 .

It is a de Polignac number, because none of the positive numbers 2^k-97915797225 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 107955222 + ... + 107956128.

Almost surely, 2^97915797225 is an apocalyptic number.

97915797225 is the 312915-th square number.

97915797225 is the 156458-th centered octagonal number.

It is an amenable number.

97915797225 is a deficient number, since it is larger than the sum of its proper divisors (85621292238).

97915797225 is an equidigital number, since it uses as much as digits as its factorization.

97915797225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876 (or 938 counting only the distinct ones).

The product of its digits is 25004700, while the sum is 63.

The spelling of 97915797225 in words is "ninety-seven billion, nine hundred fifteen million, seven hundred ninety-seven thousand, two hundred twenty-five".