253889821 has 2 divisors, whose sum is σ = 253889822. Its totient is φ = 253889820.

The previous prime is 253889807. The next prime is 253889833. The reversal of 253889821 is 128988352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248535225 + 5354596 = 15765^2 + 2314^2 .

It is a cyclic number.

It is not a de Polignac number, because 253889821 - 2⁵ = 253889789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253889851) 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, 126944910 + 126944911.

It is an arithmetic number, because the mean of its divisors is an integer number (126944911).

Almost surely, 2^253889821 is an apocalyptic number.

It is an amenable number.

253889821 is a deficient number, since it is larger than the sum of its proper divisors (1).

253889821 is an equidigital number, since it uses as much as digits as its factorization.

253889821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 46.

The square root of 253889821 is about 15933.9204529206. The cubic root of 253889821 is about 633.2109694964.

The spelling of 253889821 in words is "two hundred fifty-three million, eight hundred eighty-nine thousand, eight hundred twenty-one".