1249039819 has 2 divisors, whose sum is σ = 1249039820. Its totient is φ = 1249039818.

The previous prime is 1249039811. The next prime is 1249039901. The reversal of 1249039819 is 9189309421.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1249039819 - 2³ = 1249039811 is a prime.

It is a super-2 number, since 2×1249039819² = 3120200938895105522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1249039811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624519909 + 624519910.

It is an arithmetic number, because the mean of its divisors is an integer number (624519910).

Almost surely, 2^1249039819 is an apocalyptic number.

1249039819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249039819 is an equidigital number, since it uses as much as digits as its factorization.

1249039819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 1249039819 is about 35341.7574407386. The cubic root of 1249039819 is about 1076.9414547286.

The spelling of 1249039819 in words is "one billion, two hundred forty-nine million, thirty-nine thousand, eight hundred nineteen".