31125543 has 4 divisors (see below), whose sum is σ = 41500728. Its totient is φ = 20750360.

The previous prime is 31125529. The next prime is 31125571. The reversal of 31125543 is 34552113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34552113 = 3 ⋅11517371.

It is a cyclic number.

It is not a de Polignac number, because 31125543 - 2¹³ = 31117351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31125503) 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, 5187588 + ... + 5187593.

It is an arithmetic number, because the mean of its divisors is an integer number (10375182).

Almost surely, 2^31125543 is an apocalyptic number.

31125543 is a deficient number, since it is larger than the sum of its proper divisors (10375185).

31125543 is a wasteful number, since it uses less digits than its factorization.

31125543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10375184.

The product of its digits is 1800, while the sum is 24.

The square root of 31125543 is about 5579.0270657167. The cubic root of 31125543 is about 314.5615568141.

Adding to 31125543 its reverse (34552113), we get a palindrome (65677656).

The spelling of 31125543 in words is "thirty-one million, one hundred twenty-five thousand, five hundred forty-three".