19916877231 has 12 divisors (see below), whose sum is σ = 28835269008. Its totient is φ = 13247250624.

The previous prime is 19916877229. The next prime is 19916877247. The reversal of 19916877231 is 13277861991.

It is a happy number.

It is not a de Polignac number, because 19916877231 - 2¹ = 19916877229 is a prime.

It is a super-2 number, since 2×19916877231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19916877931) 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 11 ways as a sum of consecutive naturals, for example, 2551515 + ... + 2559308.

It is an arithmetic number, because the mean of its divisors is an integer number (2402939084).

Almost surely, 2^19916877231 is an apocalyptic number.

19916877231 is a deficient number, since it is larger than the sum of its proper divisors (8918391777).

19916877231 is a wasteful number, since it uses less digits than its factorization.

19916877231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5111262 (or 5111259 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The spelling of 19916877231 in words is "nineteen billion, nine hundred sixteen million, eight hundred seventy-seven thousand, two hundred thirty-one".