9891370953025 has 9 divisors (see below), whose sum is σ = 12265319481123. Its totient is φ = 7913084182200.

The previous prime is 9891370953011. The next prime is 9891370953089. The reversal of 9891370953025 is 5203590731989.

The square root of 9891370953025 is 3145055.

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

9891370953025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3560893543089 + 6330477409936 = 1887033^2 + 2516044^2 .

It is not a de Polignac number, because 9891370953025 - 2²¹ = 9891368855873 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, 15410770 + ... + 16039780.

Almost surely, 2^{9891370953025} is an apocalyptic number.

9891370953025 is the 3145055-th square number.

9891370953025 is the 1572528-th centered octagonal number.

It is an amenable number.

9891370953025 is a deficient number, since it is larger than the sum of its proper divisors (2373948528098).

9891370953025 is an frugal number, since it uses more digits than its factorization.

9891370953025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258032 (or 629016 counting only the distinct ones).

The product of its (nonzero) digits is 18370800, while the sum is 61.

The spelling of 9891370953025 in words is "nine trillion, eight hundred ninety-one billion, three hundred seventy million, nine hundred fifty-three thousand, twenty-five".