255817511 has 4 divisors (see below), whose sum is σ = 255852000. Its totient is φ = 255783024.

The previous prime is 255817489. The next prime is 255817531. The reversal of 255817511 is 115718552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 255817511 - 2¹⁰ = 255816487 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 (255817531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1046 + ... + 22643.

It is an arithmetic number, because the mean of its divisors is an integer number (63963000).

Almost surely, 2^255817511 is an apocalyptic number.

255817511 is a deficient number, since it is larger than the sum of its proper divisors (34489).

255817511 is a wasteful number, since it uses less digits than its factorization.

255817511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34488.

The product of its digits is 14000, while the sum is 35.

The square root of 255817511 is about 15994.2962020840. The cubic root of 255817511 is about 634.8095082398.

The spelling of 255817511 in words is "two hundred fifty-five million, eight hundred seventeen thousand, five hundred eleven".