525645421 has 16 divisors (see below), whose sum is σ = 619333120. Its totient is φ = 436700160.

The previous prime is 525645413. The next prime is 525645433. The reversal of 525645421 is 124546525.

It is a cyclic number.

It is not a de Polignac number, because 525645421 - 2³ = 525645413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525645221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66445 + ... + 73933.

It is an arithmetic number, because the mean of its divisors is an integer number (38708320).

Almost surely, 2^525645421 is an apocalyptic number.

It is an amenable number.

525645421 is a deficient number, since it is larger than the sum of its proper divisors (93687699).

525645421 is a wasteful number, since it uses less digits than its factorization.

525645421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7804.

The product of its digits is 48000, while the sum is 34.

The square root of 525645421 is about 22926.9583896338. The cubic root of 525645421 is about 807.0447719930.

The spelling of 525645421 in words is "five hundred twenty-five million, six hundred forty-five thousand, four hundred twenty-one".