525736721 has 4 divisors (see below), whose sum is σ = 526072944. Its totient is φ = 525400500.

The previous prime is 525736703. The next prime is 525736723. The reversal of 525736721 is 127637525.

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.

It is a cyclic number.

It is not a de Polignac number, because 525736721 - 2¹⁰ = 525735697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (525736723) 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, 165755 + ... + 168896.

It is an arithmetic number, because the mean of its divisors is an integer number (131518236).

Almost surely, 2^525736721 is an apocalyptic number.

It is an amenable number.

525736721 is a deficient number, since it is larger than the sum of its proper divisors (336223).

525736721 is a wasteful number, since it uses less digits than its factorization.

525736721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336222.

The product of its digits is 88200, while the sum is 38.

The square root of 525736721 is about 22928.9494089895. The cubic root of 525736721 is about 807.0914948211.

The spelling of 525736721 in words is "five hundred twenty-five million, seven hundred thirty-six thousand, seven hundred twenty-one".