253247509 has 2 divisors, whose sum is σ = 253247510. Its totient is φ = 253247508.

The previous prime is 253247443. The next prime is 253247513. The reversal of 253247509 is 905742352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252714609 + 532900 = 15897^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 253247509 - 2²⁵ = 219693077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253247569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126623754 + 126623755.

It is an arithmetic number, because the mean of its divisors is an integer number (126623755).

Almost surely, 2^253247509 is an apocalyptic number.

It is an amenable number.

253247509 is a deficient number, since it is larger than the sum of its proper divisors (1).

253247509 is an equidigital number, since it uses as much as digits as its factorization.

253247509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 253247509 is about 15913.7521973920. The cubic root of 253247509 is about 632.6765349537.

The spelling of 253247509 in words is "two hundred fifty-three million, two hundred forty-seven thousand, five hundred nine".