525211721 has 8 divisors (see below), whose sum is σ = 543595080. Its totient is φ = 506846592.

The previous prime is 525211711. The next prime is 525211723. The reversal of 525211721 is 127112525.

It can be written as a sum of positive squares in 4 ways, for example, as 311028496 + 214183225 = 17636^2 + 14635^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 525211721 - 2²² = 521017417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (525211723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82571 + ... + 88703.

It is an arithmetic number, because the mean of its divisors is an integer number (67949385).

Almost surely, 2^525211721 is an apocalyptic number.

It is an amenable number.

525211721 is a deficient number, since it is larger than the sum of its proper divisors (18383359).

525211721 is a wasteful number, since it uses less digits than its factorization.

525211721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9115.

The product of its digits is 1400, while the sum is 26.

The square root of 525211721 is about 22917.4981400676. The cubic root of 525211721 is about 806.8227518431.

The spelling of 525211721 in words is "five hundred twenty-five million, two hundred eleven thousand, seven hundred twenty-one".