253105991 has 2 divisors, whose sum is σ = 253105992. Its totient is φ = 253105990.

The previous prime is 253105949. The next prime is 253106003. The reversal of 253105991 is 199501352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 253105991 - 2¹⁰ = 253104967 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253105921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126552995 + 126552996.

It is an arithmetic number, because the mean of its divisors is an integer number (126552996).

Almost surely, 2^253105991 is an apocalyptic number.

253105991 is a deficient number, since it is larger than the sum of its proper divisors (1).

253105991 is an equidigital number, since it uses as much as digits as its factorization.

253105991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 253105991 is about 15909.3051702455. The cubic root of 253105991 is about 632.5586637043.

The spelling of 253105991 in words is "two hundred fifty-three million, one hundred five thousand, nine hundred ninety-one".