815047 has 2 divisors, whose sum is σ = 815048. Its totient is φ = 815046.

The previous prime is 815033. The next prime is 815053. The reversal of 815047 is 740518.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-815047 is a prime.

It is a super-2 number, since 2×815047² = 1328603224418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407523 + 407524.

It is an arithmetic number, because the mean of its divisors is an integer number (407524).

2⁸¹⁵⁰⁴⁷ is an apocalyptic number.

815047 is a deficient number, since it is larger than the sum of its proper divisors (1).

815047 is an equidigital number, since it uses as much as digits as its factorization.

815047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 815047 is about 902.7995347806. The cubic root of 815047 is about 93.4101818887.

Subtracting from 815047 its reverse (740518), we obtain a square (74529 = 273²).

The spelling of 815047 in words is "eight hundred fifteen thousand, forty-seven".