253743491 has 2 divisors, whose sum is σ = 253743492. Its totient is φ = 253743490.

The previous prime is 253743443. The next prime is 253743569. The reversal of 253743491 is 194347352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 253743491 - 2¹⁴ = 253727107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (253743431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126871745 + 126871746.

It is an arithmetic number, because the mean of its divisors is an integer number (126871746).

Almost surely, 2^253743491 is an apocalyptic number.

253743491 is a deficient number, since it is larger than the sum of its proper divisors (1).

253743491 is an equidigital number, since it uses as much as digits as its factorization.

253743491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 38.

The square root of 253743491 is about 15929.3280147029. The cubic root of 253743491 is about 633.0892952367.

The spelling of 253743491 in words is "two hundred fifty-three million, seven hundred forty-three thousand, four hundred ninety-one".