725815121 has 8 divisors (see below), whose sum is σ = 752345088. Its totient is φ = 699480000.

The previous prime is 725815091. The next prime is 725815151. The reversal of 725815121 is 121518527.

It is an interprime number because it is at equal distance from previous prime (725815091) and next prime (725815151).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 725815121 - 2¹⁸ = 725552977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725815151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41105 + ... + 56046.

It is an arithmetic number, because the mean of its divisors is an integer number (94043136).

Almost surely, 2^725815121 is an apocalyptic number.

It is an amenable number.

725815121 is a deficient number, since it is larger than the sum of its proper divisors (26529967).

725815121 is a wasteful number, since it uses less digits than its factorization.

725815121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97423.

The product of its digits is 5600, while the sum is 32.

The square root of 725815121 is about 26940.9562005509. The cubic root of 725815121 is about 898.6874368898.

The spelling of 725815121 in words is "seven hundred twenty-five million, eight hundred fifteen thousand, one hundred twenty-one".