19287887431 has 2 divisors, whose sum is σ = 19287887432. Its totient is φ = 19287887430.

The previous prime is 19287887413. The next prime is 19287887447. The reversal of 19287887431 is 13478878291.

Together with previous prime (19287887413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13478878291) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19287887431 is a prime.

It is a super-2 number, since 2×19287887431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19287887831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9643943715 + 9643943716.

It is an arithmetic number, because the mean of its divisors is an integer number (9643943716).

Almost surely, 2^19287887431 is an apocalyptic number.

19287887431 is a deficient number, since it is larger than the sum of its proper divisors (1).

19287887431 is an equidigital number, since it uses as much as digits as its factorization.

19287887431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5419008, while the sum is 58.

The spelling of 19287887431 in words is "nineteen billion, two hundred eighty-seven million, eight hundred eighty-seven thousand, four hundred thirty-one".