253821791 has 2 divisors, whose sum is σ = 253821792. Its totient is φ = 253821790.

The previous prime is 253821751. The next prime is 253821809. The reversal of 253821791 is 197128352.

253821791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 253821791 - 2⁶ = 253821727 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 (253821751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126910895 + 126910896.

It is an arithmetic number, because the mean of its divisors is an integer number (126910896).

Almost surely, 2^253821791 is an apocalyptic number.

253821791 is a deficient number, since it is larger than the sum of its proper divisors (1).

253821791 is an equidigital number, since it uses as much as digits as its factorization.

253821791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 253821791 is about 15931.7855559256. The cubic root of 253821791 is about 633.1544079662.

The spelling of 253821791 in words is "two hundred fifty-three million, eight hundred twenty-one thousand, seven hundred ninety-one".