1157221 has 4 divisors (see below), whose sum is σ = 1246252. Its totient is φ = 1068192.

The previous prime is 1157213. The next prime is 1157227. The reversal of 1157221 is 1227511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1227511 = 859 ⋅1429.

It can be written as a sum of positive squares in 2 ways, for example, as 264196 + 893025 = 514^2 + 945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157221 - 2³ = 1157213 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 (1157227) 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, 44496 + ... + 44521.

It is an arithmetic number, because the mean of its divisors is an integer number (311563).

2^1157221 is an apocalyptic number.

It is an amenable number.

1157221 is a deficient number, since it is larger than the sum of its proper divisors (89031).

1157221 is an equidigital number, since it uses as much as digits as its factorization.

1157221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89030.

The product of its digits is 140, while the sum is 19.

The square root of 1157221 is about 1075.7420694572. The cubic root of 1157221 is about 104.9877839151.

It can be divided in two parts, 1157 and 221, that added together give a triangular number (1378 = T₅₂).

The spelling of 1157221 in words is "one million, one hundred fifty-seven thousand, two hundred twenty-one".