525221001 has 24 divisors (see below), whose sum is σ = 830985480. Its totient is φ = 318183936.

The previous prime is 525220991. The next prime is 525221017. The reversal of 525221001 is 100122525.

It can be written as a sum of positive squares in 4 ways, for example, as 29713401 + 495507600 = 5451^2 + 22260^2 .

It is not a de Polignac number, because 525221001 - 2⁹ = 525220489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (525221101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54750 + ... + 63623.

It is an arithmetic number, because the mean of its divisors is an integer number (34624395).

Almost surely, 2^525221001 is an apocalyptic number.

525221001 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

525221001 is a deficient number, since it is larger than the sum of its proper divisors (305764479).

525221001 is a wasteful number, since it uses less digits than its factorization.

525221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118425 (or 118422 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 525221001 is about 22917.7006045546. The cubic root of 525221001 is about 806.8275037497.

Adding to 525221001 its reverse (100122525), we get a palindrome (625343526).

The spelling of 525221001 in words is "five hundred twenty-five million, two hundred twenty-one thousand, one".