1157221311 has 4 divisors (see below), whose sum is σ = 1542961752. Its totient is φ = 771480872.

The previous prime is 1157221279. The next prime is 1157221313. The reversal of 1157221311 is 1131227511.

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

It is a cyclic number.

It is not a de Polignac number, because 1157221311 - 2⁵ = 1157221279 is a prime.

It is a super-2 number, since 2×1157221311² = 2678322325265117442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157221313) 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, 192870216 + ... + 192870221.

It is an arithmetic number, because the mean of its divisors is an integer number (385740438).

Almost surely, 2^1157221311 is an apocalyptic number.

1157221311 is a deficient number, since it is larger than the sum of its proper divisors (385740441).

1157221311 is an equidigital number, since it uses as much as digits as its factorization.

1157221311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385740440.

The product of its digits is 420, while the sum is 24.

The square root of 1157221311 is about 34017.9557145928. The cubic root of 1157221311 is about 1049.8779332021.

Adding to 1157221311 its reverse (1131227511), we get a palindrome (2288448822).

The spelling of 1157221311 in words is "one billion, one hundred fifty-seven million, two hundred twenty-one thousand, three hundred eleven".