253638971 has 2 divisors, whose sum is σ = 253638972. Its totient is φ = 253638970.

The previous prime is 253638949. The next prime is 253639003. The reversal of 253638971 is 179836352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 253638971 - 2²² = 249444667 is a prime.

It is not a weakly prime, because it can be changed into another prime (253638911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126819485 + 126819486.

It is an arithmetic number, because the mean of its divisors is an integer number (126819486).

Almost surely, 2^253638971 is an apocalyptic number.

253638971 is a deficient number, since it is larger than the sum of its proper divisors (1).

253638971 is an equidigital number, since it uses as much as digits as its factorization.

253638971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The square root of 253638971 is about 15926.0469357590. The cubic root of 253638971 is about 633.0023575969.

The spelling of 253638971 in words is "two hundred fifty-three million, six hundred thirty-eight thousand, nine hundred seventy-one".