31144123 has 4 divisors (see below), whose sum is σ = 31220680. Its totient is φ = 31067568.

The previous prime is 31144111. The next prime is 31144147. The reversal of 31144123 is 32144113.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31144123 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 31144123.

It is not an unprimeable number, because it can be changed into a prime (31144103) 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, 37665 + ... + 38482.

It is an arithmetic number, because the mean of its divisors is an integer number (7805170).

Almost surely, 2^31144123 is an apocalyptic number.

31144123 is a deficient number, since it is larger than the sum of its proper divisors (76557).

31144123 is an equidigital number, since it uses as much as digits as its factorization.

31144123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76556.

The product of its digits is 288, while the sum is 19.

The square root of 31144123 is about 5580.6919821829. The cubic root of 31144123 is about 314.6241355475.

Adding to 31144123 its reverse (32144113), we get a palindrome (63288236).

The spelling of 31144123 in words is "thirty-one million, one hundred forty-four thousand, one hundred twenty-three".