525661021 has 8 divisors (see below), whose sum is σ = 549828864. Its totient is φ = 501602640.

The previous prime is 525661013. The next prime is 525661033. The reversal of 525661021 is 120166525.

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 525661021 - 2³ = 525661013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525661061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17461 + ... + 36826.

It is an arithmetic number, because the mean of its divisors is an integer number (68728608).

Almost surely, 2^525661021 is an apocalyptic number.

It is an amenable number.

525661021 is a deficient number, since it is larger than the sum of its proper divisors (24167843).

525661021 is a wasteful number, since it uses less digits than its factorization.

525661021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54731.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 525661021 is about 22927.2985979596. The cubic root of 525661021 is about 807.0527556853.

The spelling of 525661021 in words is "five hundred twenty-five million, six hundred sixty-one thousand, twenty-one".