253523681 has 2 divisors, whose sum is σ = 253523682. Its totient is φ = 253523680.

The previous prime is 253523653. The next prime is 253523693. The reversal of 253523681 is 186325352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249134656 + 4389025 = 15784^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 253523681 - 2²⁶ = 186414817 is a prime.

It is a super-2 number, since 2×253523681² = 128548513655579522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (253523651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126761840 + 126761841.

It is an arithmetic number, because the mean of its divisors is an integer number (126761841).

Almost surely, 2^253523681 is an apocalyptic number.

It is an amenable number.

253523681 is a deficient number, since it is larger than the sum of its proper divisors (1).

253523681 is an equidigital number, since it uses as much as digits as its factorization.

253523681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 253523681 is about 15922.4269820904. The cubic root of 253523681 is about 632.9064339807.

The spelling of 253523681 in words is "two hundred fifty-three million, five hundred twenty-three thousand, six hundred eighty-one".