211401431 has 4 divisors (see below), whose sum is σ = 218220864. Its totient is φ = 204582000.

The previous prime is 211401403. The next prime is 211401439. The reversal of 211401431 is 134104112.

It is a happy number.

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 211401431 - 2⁶ = 211401367 is a prime.

It is a super-2 number, since 2×211401431² = 89381130057695522, 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 (211401439) 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, 3409670 + ... + 3409731.

It is an arithmetic number, because the mean of its divisors is an integer number (54555216).

Almost surely, 2^211401431 is an apocalyptic number.

211401431 is a deficient number, since it is larger than the sum of its proper divisors (6819433).

211401431 is an equidigital number, since it uses as much as digits as its factorization.

211401431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6819432.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 211401431 is about 14539.6503052859. The cubic root of 211401431 is about 595.7114865236.

Adding to 211401431 its reverse (134104112), we get a palindrome (345505543).

The spelling of 211401431 in words is "two hundred eleven million, four hundred one thousand, four hundred thirty-one".