391769587225 has 9 divisors (see below), whose sum is σ = 485798168863. Its totient is φ = 313413166120.

The previous prime is 391769587201. The next prime is 391769587241. The reversal of 391769587225 is 522785967193.

The square root of 391769587225 is 625915.

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., 141037051401 + 250732535824 = 375549^2 + 500732^2 .

It is not a de Polignac number, because 391769587225 - 2⁵ = 391769587193 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, 3066984 + ... + 3192166.

Almost surely, 2^391769587225 is an apocalyptic number.

391769587225 is the 625915-th square number.

391769587225 is the 312958-th centered octagonal number.

It is an amenable number.

391769587225 is a deficient number, since it is larger than the sum of its proper divisors (94028581638).

391769587225 is an frugal number, since it uses more digits than its factorization.

391769587225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250376 (or 125188 counting only the distinct ones).

The product of its digits is 57153600, while the sum is 64.

Multiplying 391769587225 by its sum of digits (64), we get a square (25073253582400 = 5007320²).

The spelling of 391769587225 in words is "three hundred ninety-one billion, seven hundred sixty-nine million, five hundred eighty-seven thousand, two hundred twenty-five".