31242111 has 8 divisors (see below), whose sum is σ = 41688624. Its totient is φ = 20811840.

The previous prime is 31242109. The next prime is 31242139. The reversal of 31242111 is 11124213.

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

It is not a de Polignac number, because 31242111 - 2¹ = 31242109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31242191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1531 + ... + 8051.

It is an arithmetic number, because the mean of its divisors is an integer number (5211078).

Almost surely, 2^31242111 is an apocalyptic number.

31242111 is a deficient number, since it is larger than the sum of its proper divisors (10446513).

31242111 is a wasteful number, since it uses less digits than its factorization.

31242111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8121.

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

The square root of 31242111 is about 5589.4642856002. The cubic root of 31242111 is about 314.9537548639.

Adding to 31242111 its reverse (11124213), we get a palindrome (42366324).

The spelling of 31242111 in words is "thirty-one million, two hundred forty-two thousand, one hundred eleven".