253745731 has 2 divisors, whose sum is σ = 253745732. Its totient is φ = 253745730.

The previous prime is 253745707. The next prime is 253745747. The reversal of 253745731 is 137547352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 253745731 - 2⁷ = 253745603 is a prime.

It is a super-2 number, since 2×253745731² = 128773792001448722, which contains 22 as substring.

It is equal to p_13872871 and since 253745731 and 13872871 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (253745831) 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 as a sum of consecutive naturals, namely, 126872865 + 126872866.

It is an arithmetic number, because the mean of its divisors is an integer number (126872866).

Almost surely, 2^253745731 is an apocalyptic number.

253745731 is a deficient number, since it is larger than the sum of its proper divisors (1).

253745731 is an equidigital number, since it uses as much as digits as its factorization.

253745731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 37.

The square root of 253745731 is about 15929.3983251095. The cubic root of 253745731 is about 633.0911581625.

The spelling of 253745731 in words is "two hundred fifty-three million, seven hundred forty-five thousand, seven hundred thirty-one".