31000442403 has 16 divisors (see below), whose sum is σ = 48337346816. Its totient is φ = 17302572000.

The previous prime is 31000442357. The next prime is 31000442413. The reversal of 31000442403 is 30424400013.

It is not a de Polignac number, because 31000442403 - 2⁸ = 31000442147 is a prime.

It is a super-2 number, since 2×31000442403² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 31000442403.

It is not an unprimeable number, because it can be changed into a prime (31000442413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17164348 + ... + 17166153.

It is an arithmetic number, because the mean of its divisors is an integer number (3021084176).

Almost surely, 2^31000442403 is an apocalyptic number.

31000442403 is a deficient number, since it is larger than the sum of its proper divisors (17336904413).

31000442403 is a wasteful number, since it uses less digits than its factorization.

31000442403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34330554.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 31000442403 its reverse (30424400013), we get a palindrome (61424842416).

The spelling of 31000442403 in words is "thirty-one billion, four hundred forty-two thousand, four hundred three".