1252818491 has 2 divisors, whose sum is σ = 1252818492. Its totient is φ = 1252818490.

The previous prime is 1252818433. The next prime is 1252818493. The reversal of 1252818491 is 1948182521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1252818491 is a prime.

It is a Sophie Germain prime.

Together with 1252818493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1252818493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626409245 + 626409246.

It is an arithmetic number, because the mean of its divisors is an integer number (626409246).

Almost surely, 2^1252818491 is an apocalyptic number.

1252818491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252818491 is an equidigital number, since it uses as much as digits as its factorization.

1252818491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 41.

The square root of 1252818491 is about 35395.1760978809. The cubic root of 1252818491 is about 1078.0263712293.

The spelling of 1252818491 in words is "one billion, two hundred fifty-two million, eight hundred eighteen thousand, four hundred ninety-one".