19739487289 has 2 divisors, whose sum is σ = 19739487290. Its totient is φ = 19739487288.

The previous prime is 19739487259. The next prime is 19739487301. The reversal of 19739487289 is 98278493791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14590707264 + 5148780025 = 120792^2 + 71755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19739487289 is a prime.

It is not a weakly prime, because it can be changed into another prime (19739487259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9869743644 + 9869743645.

It is an arithmetic number, because the mean of its divisors is an integer number (9869743645).

Almost surely, 2^19739487289 is an apocalyptic number.

It is an amenable number.

19739487289 is a deficient number, since it is larger than the sum of its proper divisors (1).

19739487289 is an equidigital number, since it uses as much as digits as its factorization.

19739487289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54867456, while the sum is 67.

The spelling of 19739487289 in words is "nineteen billion, seven hundred thirty-nine million, four hundred eighty-seven thousand, two hundred eighty-nine".