253198991 has 2 divisors, whose sum is σ = 253198992. Its totient is φ = 253198990.

The previous prime is 253198961. The next prime is 253199017. The reversal of 253198991 is 199891352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 253198991 - 2¹⁴ = 253182607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253198961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126599495 + 126599496.

It is an arithmetic number, because the mean of its divisors is an integer number (126599496).

Almost surely, 2^253198991 is an apocalyptic number.

253198991 is a deficient number, since it is larger than the sum of its proper divisors (1).

253198991 is an equidigital number, since it uses as much as digits as its factorization.

253198991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 47.

The square root of 253198991 is about 15912.2277195872. The cubic root of 253198991 is about 632.6361289483.

The spelling of 253198991 in words is "two hundred fifty-three million, one hundred ninety-eight thousand, nine hundred ninety-one".