31000042403 has 4 divisors (see below), whose sum is σ = 33818228088. Its totient is φ = 28181856720.

The previous prime is 31000042399. The next prime is 31000042427. The reversal of 31000042403 is 30424000013.

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 31000042403 - 2² = 31000042399 is a prime.

It is a super-2 number, since 2×31000042403² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31000042603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1409092826 + ... + 1409092847.

It is an arithmetic number, because the mean of its divisors is an integer number (8454557022).

Almost surely, 2^31000042403 is an apocalyptic number.

31000042403 is a deficient number, since it is larger than the sum of its proper divisors (2818185685).

31000042403 is a wasteful number, since it uses less digits than its factorization.

31000042403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818185684.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 31000042403 its reverse (30424000013), we get a palindrome (61424042416).

The spelling of 31000042403 in words is "thirty-one billion, forty-two thousand, four hundred three".