1249665949 has 4 divisors (see below), whose sum is σ = 1428189664. Its totient is φ = 1071142236.

The previous prime is 1249665943. The next prime is 1249665973. The reversal of 1249665949 is 9495669421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9495669421 = 7 ⋅1356524203.

It is a cyclic number.

It is not a de Polignac number, because 1249665949 - 2⁵ = 1249665917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1249665949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249665943) 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 3 ways as a sum of consecutive naturals, for example, 89261847 + ... + 89261860.

It is an arithmetic number, because the mean of its divisors is an integer number (357047416).

Almost surely, 2^1249665949 is an apocalyptic number.

It is an amenable number.

1249665949 is a deficient number, since it is larger than the sum of its proper divisors (178523715).

1249665949 is an equidigital number, since it uses as much as digits as its factorization.

1249665949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178523714.

The product of its digits is 4199040, while the sum is 55.

The square root of 1249665949 is about 35350.6145491136. The cubic root of 1249665949 is about 1077.1213776583.

The spelling of 1249665949 in words is "one billion, two hundred forty-nine million, six hundred sixty-five thousand, nine hundred forty-nine".