211161131 has 4 divisors (see below), whose sum is σ = 223582392. Its totient is φ = 198739872.

The previous prime is 211161073. The next prime is 211161163. The reversal of 211161131 is 131161112.

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 211161131 - 2²² = 206966827 is a prime.

It is a super-2 number, since 2×211161131² = 89178046490398322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 12421243 = 211161131 / (2 + 1 + 1 + 1 + 6 + 1 + 1 + 3 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211161191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6210605 + ... + 6210638.

It is an arithmetic number, because the mean of its divisors is an integer number (55895598).

Almost surely, 2^211161131 is an apocalyptic number.

211161131 is a deficient number, since it is larger than the sum of its proper divisors (12421261).

211161131 is a wasteful number, since it uses less digits than its factorization.

211161131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12421260.

The product of its digits is 36, while the sum is 17.

The square root of 211161131 is about 14531.3843456155. The cubic root of 211161131 is about 595.4856858700.

The spelling of 211161131 in words is "two hundred eleven million, one hundred sixty-one thousand, one hundred thirty-one".