31443123 has 4 divisors (see below), whose sum is σ = 41924168. Its totient is φ = 20962080.

The previous prime is 31443091. The next prime is 31443133. The reversal of 31443123 is 32134413.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31443123 - 2⁵ = 31443091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31443123.

It is not an unprimeable number, because it can be changed into a prime (31443133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5240518 + ... + 5240523.

It is an arithmetic number, because the mean of its divisors is an integer number (10481042).

Almost surely, 2^31443123 is an apocalyptic number.

31443123 is a deficient number, since it is larger than the sum of its proper divisors (10481045).

31443123 is a wasteful number, since it uses less digits than its factorization.

31443123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10481044.

The product of its digits is 864, while the sum is 21.

The square root of 31443123 is about 5607.4167849376. The cubic root of 31443123 is about 315.6277830425.

Adding to 31443123 its reverse (32134413), we get a palindrome (63577536).

The spelling of 31443123 in words is "thirty-one million, four hundred forty-three thousand, one hundred twenty-three".