525721457 has 2 divisors, whose sum is σ = 525721458. Its totient is φ = 525721456.

The previous prime is 525721429. The next prime is 525721499. The reversal of 525721457 is 754127525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525280561 + 440896 = 22919^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 525721457 - 2⁸ = 525721201 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 525721457.

It is not a weakly prime, because it can be changed into another prime (525621457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262860728 + 262860729.

It is an arithmetic number, because the mean of its divisors is an integer number (262860729).

Almost surely, 2^525721457 is an apocalyptic number.

It is an amenable number.

525721457 is a deficient number, since it is larger than the sum of its proper divisors (1).

525721457 is an equidigital number, since it uses as much as digits as its factorization.

525721457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98000, while the sum is 38.

The square root of 525721457 is about 22928.6165522475. The cubic root of 525721457 is about 807.0836838368.

The spelling of 525721457 in words is "five hundred twenty-five million, seven hundred twenty-one thousand, four hundred fifty-seven".