42111623 has 2 divisors, whose sum is σ = 42111624. Its totient is φ = 42111622.

The previous prime is 42111611. The next prime is 42111659. The reversal of 42111623 is 32611124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42111623 - 2¹⁶ = 42046087 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 42111595 and 42111604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42111673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21055811 + 21055812.

It is an arithmetic number, because the mean of its divisors is an integer number (21055812).

Almost surely, 2^42111623 is an apocalyptic number.

42111623 is a deficient number, since it is larger than the sum of its proper divisors (1).

42111623 is an equidigital number, since it uses as much as digits as its factorization.

42111623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 20.

The square root of 42111623 is about 6489.3468854731. The cubic root of 42111623 is about 347.9103321845.

Adding to 42111623 its reverse (32611124), we get a palindrome (74722747).

The spelling of 42111623 in words is "forty-two million, one hundred eleven thousand, six hundred twenty-three".