1249021899 has 12 divisors (see below), whose sum is σ = 1862341312. Its totient is φ = 805820400.

The previous prime is 1249021889. The next prime is 1249021919. The reversal of 1249021899 is 9981209421.

It is not a de Polignac number, because 1249021899 - 2⁸ = 1249021643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249021819) 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 in 11 ways as a sum of consecutive naturals, for example, 2238112 + ... + 2238669.

Almost surely, 2^1249021899 is an apocalyptic number.

1249021899 is a deficient number, since it is larger than the sum of its proper divisors (613319413).

1249021899 is a wasteful number, since it uses less digits than its factorization.

1249021899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4476818 (or 4476815 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 1249021899 is about 35341.5039153684. The cubic root of 1249021899 is about 1076.9363044036.

The spelling of 1249021899 in words is "one billion, two hundred forty-nine million, twenty-one thousand, eight hundred ninety-nine".