253897993 has 2 divisors, whose sum is σ = 253897994. Its totient is φ = 253897992.

The previous prime is 253897979. The next prime is 253897997. The reversal of 253897993 is 399798352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187361344 + 66536649 = 13688^2 + 8157^2 .

It is a cyclic number.

It is not a de Polignac number, because 253897993 - 2⁹ = 253897481 is a prime.

It is not a weakly prime, because it can be changed into another prime (253897997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126948996 + 126948997.

It is an arithmetic number, because the mean of its divisors is an integer number (126948997).

Almost surely, 2^253897993 is an apocalyptic number.

It is an amenable number.

253897993 is a deficient number, since it is larger than the sum of its proper divisors (1).

253897993 is an equidigital number, since it uses as much as digits as its factorization.

253897993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 55.

The square root of 253897993 is about 15934.1768849225. The cubic root of 253897993 is about 633.2177631842.

The spelling of 253897993 in words is "two hundred fifty-three million, eight hundred ninety-seven thousand, nine hundred ninety-three".