253636861 has 8 divisors (see below), whose sum is σ = 257402880. Its totient is φ = 249894528.

The previous prime is 253636849. The next prime is 253636879. The reversal of 253636861 is 168636352.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 253636861 - 2²⁷ = 119419133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253636891) 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 7 ways as a sum of consecutive naturals, for example, 16260 + ... + 27778.

It is an arithmetic number, because the mean of its divisors is an integer number (32175360).

Almost surely, 2^253636861 is an apocalyptic number.

It is an amenable number.

253636861 is a deficient number, since it is larger than the sum of its proper divisors (3766019).

253636861 is a wasteful number, since it uses less digits than its factorization.

253636861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11843.

The product of its digits is 155520, while the sum is 40.

The square root of 253636861 is about 15925.9806919386. The cubic root of 253636861 is about 633.0006022953. Note that the first 3 decimals are identical.

The spelling of 253636861 in words is "two hundred fifty-three million, six hundred thirty-six thousand, eight hundred sixty-one".