31125043 has 4 divisors (see below), whose sum is σ = 31137160. Its totient is φ = 31112928.

The previous prime is 31125007. The next prime is 31125047. The reversal of 31125043 is 34052113.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34052113 = 409 ⋅83257.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31125043 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 31125043.

It is not an unprimeable number, because it can be changed into a prime (31125047) 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, 513 + ... + 7906.

It is an arithmetic number, because the mean of its divisors is an integer number (7784290).

Almost surely, 2^31125043 is an apocalyptic number.

31125043 is a deficient number, since it is larger than the sum of its proper divisors (12117).

31125043 is an equidigital number, since it uses as much as digits as its factorization.

31125043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12116.

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

The square root of 31125043 is about 5578.9822548562. The cubic root of 31125043 is about 314.5598724352.

Adding to 31125043 its reverse (34052113), we get a palindrome (65177156).

The spelling of 31125043 in words is "thirty-one million, one hundred twenty-five thousand, forty-three".