1249021919 has 2 divisors, whose sum is σ = 1249021920. Its totient is φ = 1249021918.

The previous prime is 1249021889. The next prime is 1249021997. The reversal of 1249021919 is 9191209421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1249021919 is a prime.

It is a super-2 number, since 2×1249021919² = 3120111508284885122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249021019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624510959 + 624510960.

It is an arithmetic number, because the mean of its divisors is an integer number (624510960).

Almost surely, 2^1249021919 is an apocalyptic number.

1249021919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249021919 is an equidigital number, since it uses as much as digits as its factorization.

1249021919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 1249021919 is about 35341.5041983218. The cubic root of 1249021919 is about 1076.9363101518.

The spelling of 1249021919 in words is "one billion, two hundred forty-nine million, twenty-one thousand, nine hundred nineteen".