1267281313 has 4 divisors (see below), whose sum is σ = 1267486720. Its totient is φ = 1267075908.

The previous prime is 1267281307. The next prime is 1267281317. The reversal of 1267281313 is 3131827621.

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 1267281313 - 2¹³ = 1267273121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1267281317) 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, 93153 + ... + 105886.

It is an arithmetic number, because the mean of its divisors is an integer number (316871680).

Almost surely, 2^1267281313 is an apocalyptic number.

It is an amenable number.

1267281313 is a deficient number, since it is larger than the sum of its proper divisors (205407).

1267281313 is an equidigital number, since it uses as much as digits as its factorization.

1267281313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205406.

The product of its digits is 12096, while the sum is 34.

The square root of 1267281313 is about 35598.8948283511. The cubic root of 1267281313 is about 1082.1588370678.

The spelling of 1267281313 in words is "one billion, two hundred sixty-seven million, two hundred eighty-one thousand, three hundred thirteen".