1152774221 has 4 divisors (see below), whose sum is σ = 1174524732. Its totient is φ = 1131023712.

The previous prime is 1152774209. The next prime is 1152774239. The reversal of 1152774221 is 1224772511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1224772511 = 463 ⋅2645297.

It can be written as a sum of positive squares in 2 ways, for example, as 284293321 + 868480900 = 16861^2 + 29470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1152774221 - 2²² = 1148579917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1152776221) 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, 10875176 + ... + 10875281.

It is an arithmetic number, because the mean of its divisors is an integer number (293631183).

Almost surely, 2^1152774221 is an apocalyptic number.

It is an amenable number.

1152774221 is a deficient number, since it is larger than the sum of its proper divisors (21750511).

1152774221 is an equidigital number, since it uses as much as digits as its factorization.

1152774221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21750510.

The product of its digits is 7840, while the sum is 32.

The square root of 1152774221 is about 33952.5289337923. The cubic root of 1152774221 is about 1048.5313468785.

The spelling of 1152774221 in words is "one billion, one hundred fifty-two million, seven hundred seventy-four thousand, two hundred twenty-one".