1220091173 has 16 divisors (see below), whose sum is σ = 1489973760. Its totient is φ = 975234816.

The previous prime is 1220091157. The next prime is 1220091209. The reversal of 1220091173 is 3711900221.

It is a cyclic number.

It is not a de Polignac number, because 1220091173 - 2⁴ = 1220091157 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 (1220091113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34061 + ... + 60002.

It is an arithmetic number, because the mean of its divisors is an integer number (93123360).

Almost surely, 2^1220091173 is an apocalyptic number.

It is an amenable number.

1220091173 is a deficient number, since it is larger than the sum of its proper divisors (269882587).

1220091173 is a wasteful number, since it uses less digits than its factorization.

1220091173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94196.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 1220091173 is about 34929.8035064614. The cubic root of 1220091173 is about 1068.5563472621.

Adding to 1220091173 its reverse (3711900221), we get a palindrome (4931991394).

The spelling of 1220091173 in words is "one billion, two hundred twenty million, ninety-one thousand, one hundred seventy-three".