1296776921 has 4 divisors (see below), whose sum is σ = 1414665744. Its totient is φ = 1178888100.

The previous prime is 1296776911. The next prime is 1296776951.

1296776921 is nontrivially palindromic in base 10.

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 1296776921 - 2¹⁴ = 1296760537 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 1296776921.

It is not an unprimeable number, because it can be changed into a prime (1296776911) 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, 58944395 + ... + 58944416.

It is an arithmetic number, because the mean of its divisors is an integer number (353666436).

Almost surely, 2^1296776921 is an apocalyptic number.

1296776921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1296776921 is a deficient number, since it is larger than the sum of its proper divisors (117888823).

1296776921 is a wasteful number, since it uses less digits than its factorization.

1296776921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117888822.

The product of its digits is 571536, while the sum is 50.

The square root of 1296776921 is about 36010.7889527569. The cubic root of 1296776921 is about 1090.4901762451.

The spelling of 1296776921 in words is "one billion, two hundred ninety-six million, seven hundred seventy-six thousand, nine hundred twenty-one".