1249164649 has 4 divisors (see below), whose sum is σ = 1269642820. Its totient is φ = 1228686480.

The previous prime is 1249164643. The next prime is 1249164689. The reversal of 1249164649 is 9464619421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9464619421 = 1933 ⋅4896337.

It can be written as a sum of positive squares in 2 ways, for example, as 440160400 + 809004249 = 20980^2 + 28443^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249164649 - 2⁵ = 1249164617 is a prime.

It is a super-2 number, since 2×1249164649² = 3120824640622586402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1249164599 and 1249164608.

It is not an unprimeable number, because it can be changed into a prime (1249164643) 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, 10238994 + ... + 10239115.

It is an arithmetic number, because the mean of its divisors is an integer number (317410705).

Almost surely, 2^1249164649 is an apocalyptic number.

It is an amenable number.

1249164649 is a deficient number, since it is larger than the sum of its proper divisors (20478171).

1249164649 is an equidigital number, since it uses as much as digits as its factorization.

1249164649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20478170.

The product of its digits is 373248, while the sum is 46.

The square root of 1249164649 is about 35343.5234378238. The cubic root of 1249164649 is about 1076.9773303192.

The spelling of 1249164649 in words is "one billion, two hundred forty-nine million, one hundred sixty-four thousand, six hundred forty-nine".