253811491 has 2 divisors, whose sum is σ = 253811492. Its totient is φ = 253811490.

The previous prime is 253811489. The next prime is 253811497. The reversal of 253811491 is 194118352.

253811491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 253811491 - 2¹ = 253811489 is a prime.

Together with 253811489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (253811497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126905745 + 126905746.

It is an arithmetic number, because the mean of its divisors is an integer number (126905746).

Almost surely, 2^253811491 is an apocalyptic number.

253811491 is a deficient number, since it is larger than the sum of its proper divisors (1).

253811491 is an equidigital number, since it uses as much as digits as its factorization.

253811491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 253811491 is about 15931.4622994878. The cubic root of 253811491 is about 633.1458434551.

The spelling of 253811491 in words is "two hundred fifty-three million, eight hundred eleven thousand, four hundred ninety-one".