525628721 has 2 divisors, whose sum is σ = 525628722. Its totient is φ = 525628720.

The previous prime is 525628717. The next prime is 525628739. The reversal of 525628721 is 127826525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 512524321 + 13104400 = 22639^2 + 3620^2 .

It is a cyclic number.

It is not a de Polignac number, because 525628721 - 2² = 525628717 is a prime.

It is not a weakly prime, because it can be changed into another prime (525628751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262814360 + 262814361.

It is an arithmetic number, because the mean of its divisors is an integer number (262814361).

Almost surely, 2^525628721 is an apocalyptic number.

It is an amenable number.

525628721 is a deficient number, since it is larger than the sum of its proper divisors (1).

525628721 is an equidigital number, since it uses as much as digits as its factorization.

525628721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 38.

The square root of 525628721 is about 22926.5941866645. The cubic root of 525628721 is about 807.0362251729.

The spelling of 525628721 in words is "five hundred twenty-five million, six hundred twenty-eight thousand, seven hundred twenty-one".