1249561899 has 12 divisors (see below), whose sum is σ = 1806204400. Its totient is φ = 832449744.

The previous prime is 1249561883. The next prime is 1249561909. The reversal of 1249561899 is 9981659421.

1249561899 is a `hidden beast` number, since 1 + 2 + 495 + 61 + 8 + 99 = 666.

It is not a de Polignac number, because 1249561899 - 2⁴ = 1249561883 is a prime.

It is a super-2 number, since 2×1249561899² = 3122809878864972402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249561849) 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, 35719 + ... + 61440.

Almost surely, 2^1249561899 is an apocalyptic number.

1249561899 is a deficient number, since it is larger than the sum of its proper divisors (556642501).

1249561899 is a wasteful number, since it uses less digits than its factorization.

1249561899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98594 (or 98591 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The square root of 1249561899 is about 35349.1428326063. The cubic root of 1249561899 is about 1077.0914823117.

The spelling of 1249561899 in words is "one billion, two hundred forty-nine million, five hundred sixty-one thousand, eight hundred ninety-nine".