1156642211 has 4 divisors (see below), whose sum is σ = 1156814424. Its totient is φ = 1156470000.

The previous prime is 1156642171. The next prime is 1156642229. The reversal of 1156642211 is 1122466511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1122466511 = 2267 ⋅495133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1156642211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156642231) 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, 75605 + ... + 89606.

It is an arithmetic number, because the mean of its divisors is an integer number (289203606).

Almost surely, 2^1156642211 is an apocalyptic number.

1156642211 is a deficient number, since it is larger than the sum of its proper divisors (172213).

1156642211 is an equidigital number, since it uses as much as digits as its factorization.

1156642211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172212.

The product of its digits is 2880, while the sum is 29.

The square root of 1156642211 is about 34009.4429680934. The cubic root of 1156642211 is about 1049.7027763414.

The spelling of 1156642211 in words is "one billion, one hundred fifty-six million, six hundred forty-two thousand, two hundred eleven".