31000432123 has 4 divisors (see below), whose sum is σ = 31004387568. Its totient is φ = 30996476680.

The previous prime is 31000432117. The next prime is 31000432147. The reversal of 31000432123 is 32123400013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32123400013 = 59 ⋅544464407.

It is a cyclic number.

It is not a de Polignac number, because 31000432123 - 2²⁹ = 30463561211 is a prime.

It is a super-2 number, since 2×31000432123² (a number of 22 digits) contains 22 as substring.

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 31000432123.

It is not an unprimeable number, because it can be changed into a prime (31000432153) 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, 1965943 + ... + 1981648.

It is an arithmetic number, because the mean of its divisors is an integer number (7751096892).

Almost surely, 2^31000432123 is an apocalyptic number.

31000432123 is a deficient number, since it is larger than the sum of its proper divisors (3955445).

31000432123 is an equidigital number, since it uses as much as digits as its factorization.

31000432123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3955444.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 31000432123 its reverse (32123400013), we get a palindrome (63123832136).

The spelling of 31000432123 in words is "thirty-one billion, four hundred thirty-two thousand, one hundred twenty-three".