211116431 has 4 divisors (see below), whose sum is σ = 212984832. Its totient is φ = 209248032.

The previous prime is 211116427. The next prime is 211116439. The reversal of 211116431 is 134611112.

It is a happy number.

211116431 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 211116431 - 2² = 211116427 is a prime.

It is a super-2 number, since 2×211116431² = 89140294876355522, 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 (211116439) 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, 934031 + ... + 934256.

It is an arithmetic number, because the mean of its divisors is an integer number (53246208).

Almost surely, 2^211116431 is an apocalyptic number.

211116431 is a deficient number, since it is larger than the sum of its proper divisors (1868401).

211116431 is a wasteful number, since it uses less digits than its factorization.

211116431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868400.

The product of its digits is 144, while the sum is 20.

The square root of 211116431 is about 14529.8462139143. The cubic root of 211116431 is about 595.4436641076.

Adding to 211116431 its reverse (134611112), we get a palindrome (345727543).

The spelling of 211116431 in words is "two hundred eleven million, one hundred sixteen thousand, four hundred thirty-one".