31140043 has 4 divisors (see below), whose sum is σ = 33970968. Its totient is φ = 28309120.

The previous prime is 31140029. The next prime is 31140047. The reversal of 31140043 is 34004113.

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 31140043 - 2¹³ = 31131851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31139999 and 31140026.

It is not an unprimeable number, because it can be changed into a prime (31140047) 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, 1415446 + ... + 1415467.

It is an arithmetic number, because the mean of its divisors is an integer number (8492742).

Almost surely, 2^31140043 is an apocalyptic number.

31140043 is a deficient number, since it is larger than the sum of its proper divisors (2830925).

31140043 is a wasteful number, since it uses less digits than its factorization.

31140043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830924.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31140043 is about 5580.3264241440. The cubic root of 31140043 is about 314.6103959565.

Adding to 31140043 its reverse (34004113), we get a palindrome (65144156).

The spelling of 31140043 in words is "thirty-one million, one hundred forty thousand, forty-three".