253601621 has 16 divisors (see below), whose sum is σ = 313549824. Its totient is φ = 199736064.

The previous prime is 253601609. The next prime is 253601641. The reversal of 253601621 is 126106352.

It is a cyclic number.

It is not a de Polignac number, because 253601621 - 2¹⁴ = 253585237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253601641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14045 + ... + 26541.

It is an arithmetic number, because the mean of its divisors is an integer number (19596864).

Almost surely, 2^253601621 is an apocalyptic number.

It is an amenable number.

253601621 is a deficient number, since it is larger than the sum of its proper divisors (59948203).

253601621 is a wasteful number, since it uses less digits than its factorization.

253601621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12740.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 253601621 is about 15924.8742852181. The cubic root of 253601621 is about 632.9712848237.

Adding to 253601621 its reverse (126106352), we get a palindrome (379707973).

The spelling of 253601621 in words is "two hundred fifty-three million, six hundred one thousand, six hundred twenty-one".