1266872849 has 4 divisors (see below), whose sum is σ = 1382043120. Its totient is φ = 1151702580.

The previous prime is 1266872843. The next prime is 1266872863. The reversal of 1266872849 is 9482786621.

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 a cyclic number.

It is not a de Polignac number, because 1266872849 - 2¹² = 1266868753 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 1266872849.

It is not an unprimeable number, because it can be changed into a prime (1266872843) 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, 57585119 + ... + 57585140.

It is an arithmetic number, because the mean of its divisors is an integer number (345510780).

Almost surely, 2^1266872849 is an apocalyptic number.

It is an amenable number.

1266872849 is a deficient number, since it is larger than the sum of its proper divisors (115170271).

1266872849 is a wasteful number, since it uses less digits than its factorization.

1266872849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115170270.

The product of its digits is 2322432, while the sum is 53.

The square root of 1266872849 is about 35593.1573339596. The cubic root of 1266872849 is about 1082.0425591687.

The spelling of 1266872849 in words is "one billion, two hundred sixty-six million, eight hundred seventy-two thousand, eight hundred forty-nine".