253981823 has 2 divisors, whose sum is σ = 253981824. Its totient is φ = 253981822.

The previous prime is 253981817. The next prime is 253981837. The reversal of 253981823 is 328189352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 253981823 - 2⁴ = 253981807 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 (253981223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126990911 + 126990912.

It is an arithmetic number, because the mean of its divisors is an integer number (126990912).

Almost surely, 2^253981823 is an apocalyptic number.

253981823 is a deficient number, since it is larger than the sum of its proper divisors (1).

253981823 is an equidigital number, since it uses as much as digits as its factorization.

253981823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 253981823 is about 15936.8071770979. The cubic root of 253981823 is about 633.2874457674.

The spelling of 253981823 in words is "two hundred fifty-three million, nine hundred eighty-one thousand, eight hundred twenty-three".