725521819 has 4 divisors (see below), whose sum is σ = 791478360. Its totient is φ = 659565280.

The previous prime is 725521817. The next prime is 725521829. The reversal of 725521819 is 918125527.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 725521819 - 2¹ = 725521817 is a prime.

It is a super-2 number, since 2×725521819² = 1052763819690137522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725521817) 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, 32978254 + ... + 32978275.

It is an arithmetic number, because the mean of its divisors is an integer number (197869590).

Almost surely, 2^725521819 is an apocalyptic number.

725521819 is a deficient number, since it is larger than the sum of its proper divisors (65956541).

725521819 is a wasteful number, since it uses less digits than its factorization.

725521819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65956540.

The product of its digits is 50400, while the sum is 40.

The square root of 725521819 is about 26935.5122282833. The cubic root of 725521819 is about 898.5663673372.

The spelling of 725521819 in words is "seven hundred twenty-five million, five hundred twenty-one thousand, eight hundred nineteen".