31423111 has 2 divisors, whose sum is σ = 31423112. Its totient is φ = 31423110.

The previous prime is 31423103. The next prime is 31423127. The reversal of 31423111 is 11132413.

It is an a-pointer prime, because the next prime (31423127) can be obtained adding 31423111 to its sum of digits (16).

It is a weak prime.

It is an emirp because it is prime and its reverse (11132413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31423111 - 2³ = 31423103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31423811) 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 as a sum of consecutive naturals, namely, 15711555 + 15711556.

It is an arithmetic number, because the mean of its divisors is an integer number (15711556).

Almost surely, 2^31423111 is an apocalyptic number.

31423111 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423111 is an equidigital number, since it uses as much as digits as its factorization.

31423111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 16.

The square root of 31423111 is about 5605.6320785439. The cubic root of 31423111 is about 315.5608083161.

Adding to 31423111 its reverse (11132413), we get a palindrome (42555524).

The spelling of 31423111 in words is "thirty-one million, four hundred twenty-three thousand, one hundred eleven".