1249949863 has 4 divisors (see below), whose sum is σ = 1255874008. Its totient is φ = 1244025720.

The previous prime is 1249949861. The next prime is 1249949891. The reversal of 1249949863 is 3689499421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1249949863 - 2¹ = 1249949861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249949861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2961756 + ... + 2962177.

It is an arithmetic number, because the mean of its divisors is an integer number (313968502).

Almost surely, 2^1249949863 is an apocalyptic number.

1249949863 is a deficient number, since it is larger than the sum of its proper divisors (5924145).

1249949863 is an equidigital number, since it uses as much as digits as its factorization.

1249949863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5924144.

The product of its digits is 3359232, while the sum is 55.

The square root of 1249949863 is about 35354.6300079636. The cubic root of 1249949863 is about 1077.2029425711.

The spelling of 1249949863 in words is "one billion, two hundred forty-nine million, nine hundred forty-nine thousand, eight hundred sixty-three".