815222773 has 4 divisors (see below), whose sum is σ = 815381248. Its totient is φ = 815064300.

The previous prime is 815222731. The next prime is 815222791. The reversal of 815222773 is 377222518.

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 a de Polignac number, because none of the positive numbers 2^k-815222773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815222713) 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, 71253 + ... + 81898.

It is an arithmetic number, because the mean of its divisors is an integer number (203845312).

Almost surely, 2^815222773 is an apocalyptic number.

It is an amenable number.

815222773 is a deficient number, since it is larger than the sum of its proper divisors (158475).

815222773 is a wasteful number, since it uses less digits than its factorization.

815222773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158474.

The product of its digits is 47040, while the sum is 37.

The square root of 815222773 is about 28552.1062795724. The cubic root of 815222773 is about 934.1689635125.

The spelling of 815222773 in words is "eight hundred fifteen million, two hundred twenty-two thousand, seven hundred seventy-three".