253501991 has 2 divisors, whose sum is σ = 253501992. Its totient is φ = 253501990.

The previous prime is 253501979. The next prime is 253502069. The reversal of 253501991 is 199105352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 253501991 - 2²² = 249307687 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 (253501931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126750995 + 126750996.

It is an arithmetic number, because the mean of its divisors is an integer number (126750996).

Almost surely, 2^253501991 is an apocalyptic number.

253501991 is a deficient number, since it is larger than the sum of its proper divisors (1).

253501991 is an equidigital number, since it uses as much as digits as its factorization.

253501991 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 253501991 is about 15921.7458527638. The cubic root of 253501991 is about 632.8883842111. Note that the first 3 decimals are identical.

The spelling of 253501991 in words is "two hundred fifty-three million, five hundred one thousand, nine hundred ninety-one".