253642517 has 2 divisors, whose sum is σ = 253642518. Its totient is φ = 253642516.

The previous prime is 253642483. The next prime is 253642531. The reversal of 253642517 is 715246352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253637476 + 5041 = 15926^2 + 71^2 .

It is a cyclic number.

It is not a de Polignac number, because 253642517 - 2¹² = 253638421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253642117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126821258 + 126821259.

It is an arithmetic number, because the mean of its divisors is an integer number (126821259).

Almost surely, 2^253642517 is an apocalyptic number.

It is an amenable number.

253642517 is a deficient number, since it is larger than the sum of its proper divisors (1).

253642517 is an equidigital number, since it uses as much as digits as its factorization.

253642517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 35.

The square root of 253642517 is about 15926.1582624310. The cubic root of 253642517 is about 633.0053074800.

Adding to 253642517 its reverse (715246352), we get a palindrome (968888869).

The spelling of 253642517 in words is "two hundred fifty-three million, six hundred forty-two thousand, five hundred seventeen".