1269668649 has 4 divisors (see below), whose sum is σ = 1692891536. Its totient is φ = 846445764.

The previous prime is 1269668641. The next prime is 1269668683. The reversal of 1269668649 is 9468669621.

It is a happy number.

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.

It is not a de Polignac number, because 1269668649 - 2³ = 1269668641 is a prime.

It is a super-2 number, since 2×1269668649² = 3224116956506970402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1269668641) 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, 211611439 + ... + 211611444.

It is an arithmetic number, because the mean of its divisors is an integer number (423222884).

Almost surely, 2^1269668649 is an apocalyptic number.

It is an amenable number.

1269668649 is a deficient number, since it is larger than the sum of its proper divisors (423222887).

1269668649 is an equidigital number, since it uses as much as digits as its factorization.

1269668649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423222886.

The product of its digits is 6718464, while the sum is 57.

The square root of 1269668649 is about 35632.4100924987. The cubic root of 1269668649 is about 1082.8379433683.

The spelling of 1269668649 in words is "one billion, two hundred sixty-nine million, six hundred sixty-eight thousand, six hundred forty-nine".