815052261 has 8 divisors (see below), whose sum is σ = 1087899904. Its totient is φ = 542786400.

The previous prime is 815052257. The next prime is 815052269. The reversal of 815052261 is 162250518.

815052261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 815052261 - 2² = 815052257 is a prime.

It is a super-2 number, since 2×815052261² = 1328620376322424242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815052269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142165 + ... + 147786.

It is an arithmetic number, because the mean of its divisors is an integer number (135987488).

Almost surely, 2^815052261 is an apocalyptic number.

It is an amenable number.

815052261 is a deficient number, since it is larger than the sum of its proper divisors (272847643).

815052261 is a wasteful number, since it uses less digits than its factorization.

815052261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290891.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 815052261 is about 28549.1201440605. The cubic root of 815052261 is about 934.1038287091.

The spelling of 815052261 in words is "eight hundred fifteen million, fifty-two thousand, two hundred sixty-one".