253456639 has 2 divisors, whose sum is σ = 253456640. Its totient is φ = 253456638.

The previous prime is 253456597. The next prime is 253456669. The reversal of 253456639 is 936654352.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253456639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 253456595 and 253456604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253456669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126728319 + 126728320.

It is an arithmetic number, because the mean of its divisors is an integer number (126728320).

Almost surely, 2^253456639 is an apocalyptic number.

253456639 is a deficient number, since it is larger than the sum of its proper divisors (1).

253456639 is an equidigital number, since it uses as much as digits as its factorization.

253456639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 43.

The square root of 253456639 is about 15920.3215733854. The cubic root of 253456639 is about 632.8506403053.

The spelling of 253456639 in words is "two hundred fifty-three million, four hundred fifty-six thousand, six hundred thirty-nine".