31105423 has 2 divisors, whose sum is σ = 31105424. Its totient is φ = 31105422.

The previous prime is 31105391. The next prime is 31105457. The reversal of 31105423 is 32450113.

It is a weak prime.

It is an emirp because it is prime and its reverse (32450113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31105423 - 2⁵ = 31105391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31105423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31105463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15552711 + 15552712.

It is an arithmetic number, because the mean of its divisors is an integer number (15552712).

Almost surely, 2^31105423 is an apocalyptic number.

31105423 is a deficient number, since it is larger than the sum of its proper divisors (1).

31105423 is an equidigital number, since it uses as much as digits as its factorization.

31105423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 31105423 is about 5577.2235924338. The cubic root of 31105423 is about 314.4937631617.

Adding to 31105423 its reverse (32450113), we get a palindrome (63555536).

The spelling of 31105423 in words is "thirty-one million, one hundred five thousand, four hundred twenty-three".