31012543 has 4 divisors (see below), whose sum is σ = 31202968. Its totient is φ = 30822120.

The previous prime is 31012483. The next prime is 31012561. The reversal of 31012543 is 34521013.

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

It is a cyclic number.

It is not a de Polignac number, because 31012543 - 2¹⁷ = 30881471 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 31012543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94968 + ... + 95293.

It is an arithmetic number, because the mean of its divisors is an integer number (7800742).

Almost surely, 2^31012543 is an apocalyptic number.

31012543 is a deficient number, since it is larger than the sum of its proper divisors (190425).

31012543 is a wasteful number, since it uses less digits than its factorization.

31012543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190424.

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

The square root of 31012543 is about 5568.8906435663. The cubic root of 31012543 is about 314.1804276311.

Adding to 31012543 its reverse (34521013), we get a palindrome (65533556).

The spelling of 31012543 in words is "thirty-one million, twelve thousand, five hundred forty-three".