211113431 has 4 divisors (see below), whose sum is σ = 212060352. Its totient is φ = 210166512.

The previous prime is 211113407. The next prime is 211113437. The reversal of 211113431 is 134311112.

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 211113431 - 2⁶ = 211113367 is a prime.

It is a super-2 number, since 2×211113431² = 89137761497183522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211113437) 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, 473126 + ... + 473571.

It is an arithmetic number, because the mean of its divisors is an integer number (53015088).

Almost surely, 2^211113431 is an apocalyptic number.

211113431 is a deficient number, since it is larger than the sum of its proper divisors (946921).

211113431 is an equidigital number, since it uses as much as digits as its factorization.

211113431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946920.

The product of its digits is 72, while the sum is 17.

The square root of 211113431 is about 14529.7429777681. The cubic root of 211113431 is about 595.4408436427.

Adding to 211113431 its reverse (134311112), we get a palindrome (345424543).

It can be divided in two parts, 21111 and 3431, that added together give a palindrome (24542).

The spelling of 211113431 in words is "two hundred eleven million, one hundred thirteen thousand, four hundred thirty-one".