31142211 has 4 divisors (see below), whose sum is σ = 41522952. Its totient is φ = 20761472.

The previous prime is 31142183. The next prime is 31142213. The reversal of 31142211 is 11224113.

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 31142211 - 2⁵ = 31142179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31142213) 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, 5190366 + ... + 5190371.

It is an arithmetic number, because the mean of its divisors is an integer number (10380738).

Almost surely, 2^31142211 is an apocalyptic number.

31142211 is a deficient number, since it is larger than the sum of its proper divisors (10380741).

31142211 is a wasteful number, since it uses less digits than its factorization.

31142211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10380740.

The product of its digits is 48, while the sum is 15.

The square root of 31142211 is about 5580.5206746324. The cubic root of 31142211 is about 314.6176969474.

Adding to 31142211 its reverse (11224113), we get a palindrome (42366324).

The spelling of 31142211 in words is "thirty-one million, one hundred forty-two thousand, two hundred eleven".