725165291 has 4 divisors (see below), whose sum is σ = 725629632. Its totient is φ = 724700952.

The previous prime is 725165279. The next prime is 725165293. The reversal of 725165291 is 192561527.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192561527 = 13163 ⋅14629.

It is a cyclic number.

It is not a de Polignac number, because 725165291 - 2¹⁸ = 724903147 is a prime.

It is a super-2 number, since 2×725165291² = 1051729398542229362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725165293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229820 + ... + 232953.

It is an arithmetic number, because the mean of its divisors is an integer number (181407408).

Almost surely, 2^725165291 is an apocalyptic number.

725165291 is a deficient number, since it is larger than the sum of its proper divisors (464341).

725165291 is a wasteful number, since it uses less digits than its factorization.

725165291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464340.

The product of its digits is 37800, while the sum is 38.

The square root of 725165291 is about 26928.8932375618. The cubic root of 725165291 is about 898.4191553342.

The spelling of 725165291 in words is "seven hundred twenty-five million, one hundred sixty-five thousand, two hundred ninety-one".