1011228173 has 4 divisors (see below), whose sum is σ = 1046098140. Its totient is φ = 976358208.

The previous prime is 1011228161. The next prime is 1011228191. The reversal of 1011228173 is 3718221101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 326777929 + 684450244 = 18077^2 + 26162^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011228173 - 2⁶ = 1011228109 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 (1011228103) 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, 17434940 + ... + 17434997.

It is an arithmetic number, because the mean of its divisors is an integer number (261524535).

Almost surely, 2^1011228173 is an apocalyptic number.

It is an amenable number.

1011228173 is a deficient number, since it is larger than the sum of its proper divisors (34869967).

1011228173 is an equidigital number, since it uses as much as digits as its factorization.

1011228173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34869966.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 1011228173 is about 31799.8140403368. The cubic root of 1011228173 is about 1003.7288030792.

Adding to 1011228173 its reverse (3718221101), we get a palindrome (4729449274).

The spelling of 1011228173 in words is "one billion, eleven million, two hundred twenty-eight thousand, one hundred seventy-three".