815147 has 4 divisors (see below), whose sum is σ = 837216. Its totient is φ = 793080.

The previous prime is 815141. The next prime is 815149. The reversal of 815147 is 741518.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 741518 = 2 ⋅370759.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-815147 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (815141) 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, 10979 + ... + 11052.

It is an arithmetic number, because the mean of its divisors is an integer number (209304).

2⁸¹⁵¹⁴⁷ is an apocalyptic number.

815147 is a deficient number, since it is larger than the sum of its proper divisors (22069).

815147 is a wasteful number, since it uses less digits than its factorization.

815147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22068.

The product of its digits is 1120, while the sum is 26.

The square root of 815147 is about 902.8549163625. The cubic root of 815147 is about 93.4140019695.

It can be divided in two parts, 815 and 147, that multiplied together give a triangular number (119805 = T₄₈₉).

The spelling of 815147 in words is "eight hundred fifteen thousand, one hundred forty-seven".