211304131 has 4 divisors (see below), whose sum is σ = 214457992. Its totient is φ = 208150272.

The previous prime is 211304129. The next prime is 211304141. The reversal of 211304131 is 131403112.

211304131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211304131 - 2¹ = 211304129 is a prime.

It is a super-2 number, since 2×211304131² = 89298871555330322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211304141) 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, 1576830 + ... + 1576963.

It is an arithmetic number, because the mean of its divisors is an integer number (53614498).

Almost surely, 2^211304131 is an apocalyptic number.

211304131 is a deficient number, since it is larger than the sum of its proper divisors (3153861).

211304131 is an equidigital number, since it uses as much as digits as its factorization.

211304131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3153860.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 211304131 is about 14536.3038974837. The cubic root of 211304131 is about 595.6200780875.

Adding to 211304131 its reverse (131403112), we get a palindrome (342707243).

The spelling of 211304131 in words is "two hundred eleven million, three hundred four thousand, one hundred thirty-one".