31123430043 has 4 divisors (see below), whose sum is σ = 41497906728. Its totient is φ = 20748953360.

The previous prime is 31123430011. The next prime is 31123430047. The reversal of 31123430043 is 34003432113.

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 31123430043 - 2⁵ = 31123430011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31123429995 and 31123430022.

It is not an unprimeable number, because it can be changed into a prime (31123430047) 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, 5187238338 + ... + 5187238343.

It is an arithmetic number, because the mean of its divisors is an integer number (10374476682).

Almost surely, 2^31123430043 is an apocalyptic number.

31123430043 is a deficient number, since it is larger than the sum of its proper divisors (10374476685).

31123430043 is a wasteful number, since it uses less digits than its factorization.

31123430043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10374476684.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 31123430043 its reverse (34003432113), we get a palindrome (65126862156).

The spelling of 31123430043 in words is "thirty-one billion, one hundred twenty-three million, four hundred thirty thousand, forty-three".