253435691 has 4 divisors (see below), whose sum is σ = 254142000. Its totient is φ = 252729384.

The previous prime is 253435649. The next prime is 253435753. The reversal of 253435691 is 196534352.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 253435691 - 2¹⁴ = 253419307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253435631) 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 in 3 ways as a sum of consecutive naturals, for example, 352616 + ... + 353333.

It is an arithmetic number, because the mean of its divisors is an integer number (63535500).

Almost surely, 2^253435691 is an apocalyptic number.

253435691 is a deficient number, since it is larger than the sum of its proper divisors (706309).

253435691 is an equidigital number, since it uses as much as digits as its factorization.

253435691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706308.

The product of its digits is 97200, while the sum is 38.

The square root of 253435691 is about 15919.6636585074. The cubic root of 253435691 is about 632.8332049489.

The spelling of 253435691 in words is "two hundred fifty-three million, four hundred thirty-five thousand, six hundred ninety-one".