1277996813 has 8 divisors (see below), whose sum is σ = 1290556800. Its totient is φ = 1265497408.

The previous prime is 1277996807. The next prime is 1277996833. The reversal of 1277996813 is 3186997721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1277996813 - 2²⁶ = 1210887949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277996803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27845 + ... + 57717.

It is an arithmetic number, because the mean of its divisors is an integer number (161319600).

Almost surely, 2^1277996813 is an apocalyptic number.

It is an amenable number.

1277996813 is a deficient number, since it is larger than the sum of its proper divisors (12559987).

1277996813 is a wasteful number, since it uses less digits than its factorization.

1277996813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30291.

The product of its digits is 1143072, while the sum is 53.

The square root of 1277996813 is about 35749.0812888947. The cubic root of 1277996813 is about 1085.2003461080.

The spelling of 1277996813 in words is "one billion, two hundred seventy-seven million, nine hundred ninety-six thousand, eight hundred thirteen".