211400031 has 8 divisors (see below), whose sum is σ = 287864064. Its totient is φ = 137934680.

The previous prime is 211400027. The next prime is 211400081. The reversal of 211400031 is 130004112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211400031 - 2² = 211400027 is a prime.

It is a super-2 number, since 2×211400031² = 89379946213601922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211400081) 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 7 ways as a sum of consecutive naturals, for example, 749505 + ... + 749786.

It is an arithmetic number, because the mean of its divisors is an integer number (35983008).

Almost surely, 2^211400031 is an apocalyptic number.

211400031 is a deficient number, since it is larger than the sum of its proper divisors (76464033).

211400031 is a wasteful number, since it uses less digits than its factorization.

211400031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499341.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 211400031 is about 14539.6021609946. The cubic root of 211400031 is about 595.7101714932.

Adding to 211400031 its reverse (130004112), we get a palindrome (341404143).

The spelling of 211400031 in words is "two hundred eleven million, four hundred thousand, thirty-one".