253855691 has 2 divisors, whose sum is σ = 253855692. Its totient is φ = 253855690.

The previous prime is 253855649. The next prime is 253855729. The reversal of 253855691 is 196558352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 253855691 - 2¹⁴ = 253839307 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (253851691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126927845 + 126927846.

It is an arithmetic number, because the mean of its divisors is an integer number (126927846).

Almost surely, 2^253855691 is an apocalyptic number.

253855691 is a deficient number, since it is larger than the sum of its proper divisors (1).

253855691 is an equidigital number, since it uses as much as digits as its factorization.

253855691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324000, while the sum is 44.

The square root of 253855691 is about 15932.8494312850. The cubic root of 253855691 is about 633.1825943811.

The spelling of 253855691 in words is "two hundred fifty-three million, eight hundred fifty-five thousand, six hundred ninety-one".