525064721 has 4 divisors (see below), whose sum is σ = 526753344. Its totient is φ = 523376100.

The previous prime is 525064697. The next prime is 525064733. The reversal of 525064721 is 127460525.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 525064721 - 2²² = 520870417 is a prime.

It is a super-2 number, since 2×525064721² = 551385922477615682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (525061721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843845 + ... + 844466.

It is an arithmetic number, because the mean of its divisors is an integer number (131688336).

Almost surely, 2^525064721 is an apocalyptic number.

It is an amenable number.

525064721 is a deficient number, since it is larger than the sum of its proper divisors (1688623).

525064721 is a wasteful number, since it uses less digits than its factorization.

525064721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688622.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 525064721 is about 22914.2907592620. The cubic root of 525064721 is about 806.7474717185.

The spelling of 525064721 in words is "five hundred twenty-five million, sixty-four thousand, seven hundred twenty-one".