253145521 has 16 divisors (see below), whose sum is σ = 286530048. Its totient is φ = 222323200.

The previous prime is 253145507. The next prime is 253145533. The reversal of 253145521 is 125541352.

It is a cyclic number.

It is not a de Polignac number, because 253145521 - 2⁵ = 253145489 is a prime.

It is a super-2 number, since 2×253145521² = 128165309604722882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 253145521.

It is not an unprimeable number, because it can be changed into a prime (253145021) 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, 8136 + ... + 23926.

It is an arithmetic number, because the mean of its divisors is an integer number (17908128).

Almost surely, 2^253145521 is an apocalyptic number.

It is an amenable number.

253145521 is a deficient number, since it is larger than the sum of its proper divisors (33384527).

253145521 is a wasteful number, since it uses less digits than its factorization.

253145521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15872.

The product of its digits is 6000, while the sum is 28.

The square root of 253145521 is about 15910.5474764384. The cubic root of 253145521 is about 632.5915929161.

Adding to 253145521 its reverse (125541352), we get a palindrome (378686873).

The spelling of 253145521 in words is "two hundred fifty-three million, one hundred forty-five thousand, five hundred twenty-one".