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809115049 = 1579151239
BaseRepresentation
bin110000001110100…
…001110110101001
32002101111022012001
4300032201312221
53124113140144
6212142051001
726023236001
oct6016416651
92071438161
10809115049
113857a7126
121a6b79a61
13cb824a02
147965d001
154b077bd4
hex303a1da9

809115049 has 4 divisors (see below), whose sum is σ = 809182080. Its totient is φ = 809048020.

The previous prime is 809115037. The next prime is 809115059. The reversal of 809115049 is 940511908.

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, 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 809115049 - 223 = 800726441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 809114999 and 809115017.

It is not an unprimeable number, because it can be changed into a prime (809115059) 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, 9829 + ... + 41410.

It is an arithmetic number, because the mean of its divisors is an integer number (202295520).

Almost surely, 2809115049 is an apocalyptic number.

It is an amenable number.

809115049 is a deficient number, since it is larger than the sum of its proper divisors (67031).

809115049 is a wasteful number, since it uses less digits than its factorization.

809115049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67030.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 809115049 is about 28444.9476884736. The cubic root of 809115049 is about 931.8301529568.

The spelling of 809115049 in words is "eight hundred nine million, one hundred fifteen thousand, forty-nine".

Divisors: 1 15791 51239 809115049