1267681849 has 4 divisors (see below), whose sum is σ = 1448779264. Its totient is φ = 1086584436.

The previous prime is 1267681841. The next prime is 1267681859. The reversal of 1267681849 is 9481867621.

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 1267681849 - 2³ = 1267681841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1267681796 and 1267681805.

It is not an unprimeable number, because it can be changed into a prime (1267681841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90548697 + ... + 90548710.

It is an arithmetic number, because the mean of its divisors is an integer number (362194816).

Almost surely, 2^1267681849 is an apocalyptic number.

It is an amenable number.

1267681849 is a deficient number, since it is larger than the sum of its proper divisors (181097415).

1267681849 is an equidigital number, since it uses as much as digits as its factorization.

1267681849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181097414.

The product of its digits is 1161216, while the sum is 52.

The square root of 1267681849 is about 35604.5200641716. The cubic root of 1267681849 is about 1082.2728338342.

The spelling of 1267681849 in words is "one billion, two hundred sixty-seven million, six hundred eighty-one thousand, eight hundred forty-nine".