1248939889 has 2 divisors, whose sum is σ = 1248939890. Its totient is φ = 1248939888.

The previous prime is 1248939877. The next prime is 1248939899. The reversal of 1248939889 is 9889398421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1208744289 + 40195600 = 34767^2 + 6340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1248939889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1248939829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624469944 + 624469945.

It is an arithmetic number, because the mean of its divisors is an integer number (624469945).

Almost surely, 2^1248939889 is an apocalyptic number.

It is an amenable number.

1248939889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1248939889 is an equidigital number, since it uses as much as digits as its factorization.

1248939889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8957952, while the sum is 61.

The square root of 1248939889 is about 35340.3436457542. The cubic root of 1248939889 is about 1076.9127335654.

The spelling of 1248939889 in words is "one billion, two hundred forty-eight million, nine hundred thirty-nine thousand, eight hundred eighty-nine".