19519928587 has 2 divisors, whose sum is σ = 19519928588. Its totient is φ = 19519928586.

The previous prime is 19519928551. The next prime is 19519928621. The reversal of 19519928587 is 78582991591.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19519928587 is a prime.

It is a super-2 number, since 2×19519928587² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19519928387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9759964293 + 9759964294.

It is an arithmetic number, because the mean of its divisors is an integer number (9759964294).

Almost surely, 2^19519928587 is an apocalyptic number.

19519928587 is a deficient number, since it is larger than the sum of its proper divisors (1).

19519928587 is an equidigital number, since it uses as much as digits as its factorization.

19519928587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16329600, while the sum is 64.

The spelling of 19519928587 in words is "nineteen billion, five hundred nineteen million, nine hundred twenty-eight thousand, five hundred eighty-seven".