19587472889 has 2 divisors, whose sum is σ = 19587472890. Its totient is φ = 19587472888.

The previous prime is 19587472787. The next prime is 19587472937. The reversal of 19587472889 is 98827478591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15222624400 + 4364848489 = 123380^2 + 66067^2 .

It is a cyclic number.

It is not a de Polignac number, because 19587472889 - 2⁸ = 19587472633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19587471889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9793736444 + 9793736445.

It is an arithmetic number, because the mean of its divisors is an integer number (9793736445).

Almost surely, 2^19587472889 is an apocalyptic number.

It is an amenable number.

19587472889 is a deficient number, since it is larger than the sum of its proper divisors (1).

19587472889 is an equidigital number, since it uses as much as digits as its factorization.

19587472889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81285120, while the sum is 68.

The spelling of 19587472889 in words is "nineteen billion, five hundred eighty-seven million, four hundred seventy-two thousand, eight hundred eighty-nine".