815249 has 4 divisors (see below), whose sum is σ = 820800. Its totient is φ = 809700.

The previous prime is 815231. The next prime is 815251. The reversal of 815249 is 942518.

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 an emirpimes, since its reverse is a distinct semiprime: 942518 = 2 ⋅471259.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-815249 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 815249.

It is not an unprimeable number, because it can be changed into a prime (815209) 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, 2549 + ... + 2850.

It is an arithmetic number, because the mean of its divisors is an integer number (205200).

2⁸¹⁵²⁴⁹ is an apocalyptic number.

It is an amenable number.

815249 is a deficient number, since it is larger than the sum of its proper divisors (5551).

815249 is a wasteful number, since it uses less digits than its factorization.

815249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5550.

The product of its digits is 2880, while the sum is 29.

The square root of 815249 is about 902.9114020766. The cubic root of 815249 is about 93.4178981301.

The spelling of 815249 in words is "eight hundred fifteen thousand, two hundred forty-nine".