253905823 has 2 divisors, whose sum is σ = 253905824. Its totient is φ = 253905822.

The previous prime is 253905787. The next prime is 253905833. The reversal of 253905823 is 328509352.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253905823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253905833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126952911 + 126952912.

It is an arithmetic number, because the mean of its divisors is an integer number (126952912).

Almost surely, 2^253905823 is an apocalyptic number.

253905823 is a deficient number, since it is larger than the sum of its proper divisors (1).

253905823 is an equidigital number, since it uses as much as digits as its factorization.

253905823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 253905823 is about 15934.4225813175. The cubic root of 253905823 is about 633.2242724179.

It can be divided in two parts, 25390 and 5823, that added together give a palindrome (31213).

The spelling of 253905823 in words is "two hundred fifty-three million, nine hundred five thousand, eight hundred twenty-three".