725505137 has 4 divisors (see below), whose sum is σ = 829148736. Its totient is φ = 621861540.

The previous prime is 725505133. The next prime is 725505149. The reversal of 725505137 is 731505527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 731505527 = 181 ⋅4041467.

It is a cyclic number.

It is not a de Polignac number, because 725505137 - 2² = 725505133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 725505097 and 725505106.

It is not an unprimeable number, because it can be changed into a prime (725505133) 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, 51821789 + ... + 51821802.

It is an arithmetic number, because the mean of its divisors is an integer number (207287184).

Almost surely, 2^725505137 is an apocalyptic number.

It is an amenable number.

725505137 is a deficient number, since it is larger than the sum of its proper divisors (103643599).

725505137 is a wasteful number, since it uses less digits than its factorization.

725505137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103643598.

The product of its (nonzero) digits is 36750, while the sum is 35.

The square root of 725505137 is about 26935.2025609610. The cubic root of 725505137 is about 898.5594803406.

The spelling of 725505137 in words is "seven hundred twenty-five million, five hundred five thousand, one hundred thirty-seven".