253903217 has 2 divisors, whose sum is σ = 253903218. Its totient is φ = 253903216.

The previous prime is 253903159. The next prime is 253903219. The reversal of 253903217 is 712309352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233508961 + 20394256 = 15281^2 + 4516^2 .

It is a cyclic number.

It is not a de Polignac number, because 253903217 - 2¹⁶ = 253837681 is a prime.

Together with 253903219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (253903219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126951608 + 126951609.

It is an arithmetic number, because the mean of its divisors is an integer number (126951609).

Almost surely, 2^253903217 is an apocalyptic number.

It is an amenable number.

253903217 is a deficient number, since it is larger than the sum of its proper divisors (1).

253903217 is an equidigital number, since it uses as much as digits as its factorization.

253903217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 253903217 is about 15934.3408084552. The cubic root of 253903217 is about 633.2221060135. Note that the first 3 decimals are identical.

The spelling of 253903217 in words is "two hundred fifty-three million, nine hundred three thousand, two hundred seventeen".