815936261 has 16 divisors (see below), whose sum is σ = 940498944. Its totient is φ = 693401904.

The previous prime is 815936249. The next prime is 815936263. The reversal of 815936261 is 162639518.

It is a cyclic number.

It is not a de Polignac number, because 815936261 - 2¹⁴ = 815919877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815936263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440840 + ... + 442686.

It is an arithmetic number, because the mean of its divisors is an integer number (58781184).

Almost surely, 2^815936261 is an apocalyptic number.

It is an amenable number.

815936261 is a deficient number, since it is larger than the sum of its proper divisors (124562683).

815936261 is a wasteful number, since it uses less digits than its factorization.

815936261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360.

The product of its digits is 77760, while the sum is 41.

The square root of 815936261 is about 28564.5980367307. The cubic root of 815936261 is about 934.4414141910.

The spelling of 815936261 in words is "eight hundred fifteen million, nine hundred thirty-six thousand, two hundred sixty-one".