815361 has 4 divisors (see below), whose sum is σ = 1087152. Its totient is φ = 543572.

The previous prime is 815351. The next prime is 815389. The reversal of 815361 is 163518.

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.

It is a cyclic number.

It is not a de Polignac number, because 815361 - 2¹⁰ = 814337 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (815341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135891 + ... + 135896.

It is an arithmetic number, because the mean of its divisors is an integer number (271788).

2⁸¹⁵³⁶¹ is an apocalyptic number.

It is an amenable number.

815361 is a deficient number, since it is larger than the sum of its proper divisors (271791).

815361 is a wasteful number, since it uses less digits than its factorization.

815361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271790.

The product of its digits is 720, while the sum is 24.

The square root of 815361 is about 902.9734215358. The cubic root of 815361 is about 93.4221758928.

Adding to 815361 its reverse (163518), we get a palindrome (978879).

It can be divided in two parts, 815 and 361, that added together give a triangular number (1176 = T₄₈).

The spelling of 815361 in words is "eight hundred fifteen thousand, three hundred sixty-one".