31420111 has 4 divisors (see below), whose sum is σ = 32088672. Its totient is φ = 30751552.

The previous prime is 31420099. The next prime is 31420133. The reversal of 31420111 is 11102413.

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 31420111 - 2⁹ = 31419599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31420091 and 31420100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421111) 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 3 ways as a sum of consecutive naturals, for example, 334210 + ... + 334303.

It is an arithmetic number, because the mean of its divisors is an integer number (8022168).

Almost surely, 2^31420111 is an apocalyptic number.

31420111 is a deficient number, since it is larger than the sum of its proper divisors (668561).

31420111 is an equidigital number, since it uses as much as digits as its factorization.

31420111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668560.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 31420111 is about 5605.3644841348. The cubic root of 31420111 is about 315.5507656805.

Adding to 31420111 its reverse (11102413), we get a palindrome (42522524).

The spelling of 31420111 in words is "thirty-one million, four hundred twenty thousand, one hundred eleven".