31400211 has 4 divisors (see below), whose sum is σ = 41866952. Its totient is φ = 20933472.

The previous prime is 31400189. The next prime is 31400231. The reversal of 31400211 is 11200413.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31400211 - 2²¹ = 29303059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31400231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5233366 + ... + 5233371.

It is an arithmetic number, because the mean of its divisors is an integer number (10466738).

Almost surely, 2^31400211 is an apocalyptic number.

31400211 is a deficient number, since it is larger than the sum of its proper divisors (10466741).

31400211 is a wasteful number, since it uses less digits than its factorization.

31400211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10466740.

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

The square root of 31400211 is about 5603.5891176995. The cubic root of 31400211 is about 315.4841333421.

Adding to 31400211 its reverse (11200413), we get a palindrome (42600624).

The spelling of 31400211 in words is "thirty-one million, four hundred thousand, two hundred eleven".