19880306249 has 2 divisors, whose sum is σ = 19880306250. Its totient is φ = 19880306248.

The previous prime is 19880306221. The next prime is 19880306261. The reversal of 19880306249 is 94260308891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16754713600 + 3125592649 = 129440^2 + 55907^2 .

It is a cyclic number.

It is not a de Polignac number, because 19880306249 - 2⁸ = 19880305993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19880306197 and 19880306206.

It is not a weakly prime, because it can be changed into another prime (19880306219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940153124 + 9940153125.

It is an arithmetic number, because the mean of its divisors is an integer number (9940153125).

Almost surely, 2^19880306249 is an apocalyptic number.

It is an amenable number.

19880306249 is a deficient number, since it is larger than the sum of its proper divisors (1).

19880306249 is an equidigital number, since it uses as much as digits as its factorization.

19880306249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 19880306249 in words is "nineteen billion, eight hundred eighty million, three hundred six thousand, two hundred forty-nine".