253203991 has 2 divisors, whose sum is σ = 253203992. Its totient is φ = 253203990.

The previous prime is 253203989. The next prime is 253204027. The reversal of 253203991 is 199302352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 253203991 - 2¹ = 253203989 is a prime.

It is a super-2 number, since 2×253203991² = 128224522116656162, which contains 22 as substring.

Together with 253203989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253203911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126601995 + 126601996.

It is an arithmetic number, because the mean of its divisors is an integer number (126601996).

Almost surely, 2^253203991 is an apocalyptic number.

253203991 is a deficient number, since it is larger than the sum of its proper divisors (1).

253203991 is an equidigital number, since it uses as much as digits as its factorization.

253203991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 253203991 is about 15912.3848306908. The cubic root of 253203991 is about 632.6402932090.

The spelling of 253203991 in words is "two hundred fifty-three million, two hundred three thousand, nine hundred ninety-one".