211140431 has 4 divisors (see below), whose sum is σ = 212538864. Its totient is φ = 209742000.

The previous prime is 211140343. The next prime is 211140451. The reversal of 211140431 is 134041112.

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 211140431 - 2¹⁸ = 210878287 is a prime.

It is a super-2 number, since 2×211140431² = 89160563205731522, 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 (211140451) 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, 698990 + ... + 699291.

It is an arithmetic number, because the mean of its divisors is an integer number (53134716).

Almost surely, 2^211140431 is an apocalyptic number.

211140431 is a deficient number, since it is larger than the sum of its proper divisors (1398433).

211140431 is a wasteful number, since it uses less digits than its factorization.

211140431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398432.

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

The square root of 211140431 is about 14530.6720766797. The cubic root of 211140431 is about 595.4662268650.

Adding to 211140431 its reverse (134041112), we get a palindrome (345181543).

The spelling of 211140431 in words is "two hundred eleven million, one hundred forty thousand, four hundred thirty-one".