725719221 has 18 divisors (see below), whose sum is σ = 1077376482. Its totient is φ = 470728800.

The previous prime is 725719219. The next prime is 725719223. The reversal of 725719221 is 122917527.

It is an interprime number because it is at equal distance from previous prime (725719219) and next prime (725719223).

It can be written as a sum of positive squares in 3 ways, for example, as 210656196 + 515063025 = 14514^2 + 22695^2 .

It is not a de Polignac number, because 725719221 - 2¹ = 725719219 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725719223) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 17130 + ... + 41771.

It is an arithmetic number, because the mean of its divisors is an integer number (59854249).

Almost surely, 2^725719221 is an apocalyptic number.

It is an amenable number.

725719221 is a deficient number, since it is larger than the sum of its proper divisors (351657261).

725719221 is a wasteful number, since it uses less digits than its factorization.

725719221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58981 (or 58941 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 725719221 is about 26939.1763237112. The cubic root of 725719221 is about 898.6478547617.

The spelling of 725719221 in words is "seven hundred twenty-five million, seven hundred nineteen thousand, two hundred twenty-one".