724525861 has 4 divisors (see below), whose sum is σ = 724697632. Its totient is φ = 724354092.

The previous prime is 724525859. The next prime is 724525891. The reversal of 724525861 is 168525427.

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: 168525427 = 7 ⋅24075061.

It is a cyclic number.

It is not a de Polignac number, because 724525861 - 2¹ = 724525859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724525891) 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, 79395 + ... + 88048.

It is an arithmetic number, because the mean of its divisors is an integer number (181174408).

It is a 4218-hyperperfect number.

Almost surely, 2^724525861 is an apocalyptic number.

It is an amenable number.

724525861 is a deficient number, since it is larger than the sum of its proper divisors (171771).

724525861 is a wasteful number, since it uses less digits than its factorization.

724525861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171770.

The product of its digits is 134400, while the sum is 40.

The square root of 724525861 is about 26917.0180554979. The cubic root of 724525861 is about 898.1550109142.

The spelling of 724525861 in words is "seven hundred twenty-four million, five hundred twenty-five thousand, eight hundred sixty-one".