1273266813 has 48 divisors (see below), whose sum is σ = 2195483136. Its totient is φ = 649918080.

The previous prime is 1273266811. The next prime is 1273266853. The reversal of 1273266813 is 3186623721.

1273266813 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1273266813 - 2¹ = 1273266811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273266811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48495 + ... + 69987.

It is an arithmetic number, because the mean of its divisors is an integer number (45739232).

Almost surely, 2^1273266813 is an apocalyptic number.

1273266813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1273266813 is a deficient number, since it is larger than the sum of its proper divisors (922216323).

1273266813 is a wasteful number, since it uses less digits than its factorization.

1273266813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21554 (or 21547 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 1273266813 is about 35682.8644169719. The cubic root of 1273266813 is about 1083.8598776433.

The spelling of 1273266813 in words is "one billion, two hundred seventy-three million, two hundred sixty-six thousand, eight hundred thirteen".