19868487031 has 2 divisors, whose sum is σ = 19868487032. Its totient is φ = 19868487030.

The previous prime is 19868487029. The next prime is 19868487043. The reversal of 19868487031 is 13078486891.

It is a weak prime.

It is an emirp because it is prime and its reverse (13078486891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19868487031 - 2¹ = 19868487029 is a prime.

It is a super-2 number, since 2×19868487031² (a number of 21 digits) contains 22 as substring.

Together with 19868487029, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19868487071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9934243515 + 9934243516.

It is an arithmetic number, because the mean of its divisors is an integer number (9934243516).

Almost surely, 2^19868487031 is an apocalyptic number.

19868487031 is a deficient number, since it is larger than the sum of its proper divisors (1).

19868487031 is an equidigital number, since it uses as much as digits as its factorization.

19868487031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 19868487031 in words is "nineteen billion, eight hundred sixty-eight million, four hundred eighty-seven thousand, thirty-one".