815298261 has 4 divisors (see below), whose sum is σ = 1087064352. Its totient is φ = 543532172.

The previous prime is 815298229. The next prime is 815298271. The reversal of 815298261 is 162892518.

It is a happy number.

815298261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 815298261 - 2⁵ = 815298229 is a prime.

It is a super-2 number, since 2×815298261² = 1329422508779248242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815298221) 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, 135883041 + ... + 135883046.

It is an arithmetic number, because the mean of its divisors is an integer number (271766088).

Almost surely, 2^815298261 is an apocalyptic number.

It is an amenable number.

815298261 is a deficient number, since it is larger than the sum of its proper divisors (271766091).

815298261 is a wasteful number, since it uses less digits than its factorization.

815298261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271766090.

The product of its digits is 69120, while the sum is 42.

The square root of 815298261 is about 28553.4281829696. The cubic root of 815298261 is about 934.1977966824.

The spelling of 815298261 in words is "eight hundred fifteen million, two hundred ninety-eight thousand, two hundred sixty-one".