211345131 has 4 divisors (see below), whose sum is σ = 281793512. Its totient is φ = 140896752.

The previous prime is 211345117. The next prime is 211345153. The reversal of 211345131 is 131543112.

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

It is not a de Polignac number, because 211345131 - 2⁶ = 211345067 is a prime.

It is a super-2 number, since 2×211345131² = 89333528794814322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211345098 and 211345107.

It is not an unprimeable number, because it can be changed into a prime (211345031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35224186 + ... + 35224191.

It is an arithmetic number, because the mean of its divisors is an integer number (70448378).

Almost surely, 2^211345131 is an apocalyptic number.

211345131 is a deficient number, since it is larger than the sum of its proper divisors (70448381).

211345131 is an equidigital number, since it uses as much as digits as its factorization.

211345131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70448380.

The product of its digits is 360, while the sum is 21.

The square root of 211345131 is about 14537.7140912868. The cubic root of 211345131 is about 595.6585989370.

Adding to 211345131 its reverse (131543112), we get a palindrome (342888243).

The spelling of 211345131 in words is "two hundred eleven million, three hundred forty-five thousand, one hundred thirty-one".