815181242 has 8 divisors (see below), whose sum is σ = 1264936500. Its totient is φ = 393535744.

The previous prime is 815181223. The next prime is 815181259. The reversal of 815181242 is 242181518.

It can be written as a sum of positive squares in 2 ways, for example, as 784056001 + 31125241 = 28001^2 + 5579^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 815181199 and 815181208.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7027367 + ... + 7027482.

Almost surely, 2^815181242 is an apocalyptic number.

815181242 is a deficient number, since it is larger than the sum of its proper divisors (449755258).

815181242 is a wasteful number, since it uses less digits than its factorization.

815181242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14054880.

The product of its digits is 5120, while the sum is 32.

The square root of 815181242 is about 28551.3789859614. The cubic root of 815181242 is about 934.1530996974.

The spelling of 815181242 in words is "eight hundred fifteen million, one hundred eighty-one thousand, two hundred forty-two".