1313764921 has 6 divisors (see below), whose sum is σ = 1528257210. Its totient is φ = 1126084176.

The previous prime is 1313764909. The next prime is 1313764961. The reversal of 1313764921 is 1294673131.

It can be written as a sum of positive squares in only one way, i.e., 885895696 + 427869225 = 29764^2 + 20685^2 .

It is not a de Polignac number, because 1313764921 - 2²¹ = 1311667769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313764961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13405716 + ... + 13405813.

It is an arithmetic number, because the mean of its divisors is an integer number (254709535).

Almost surely, 2^1313764921 is an apocalyptic number.

It is an amenable number.

1313764921 is a deficient number, since it is larger than the sum of its proper divisors (214492289).

1313764921 is an equidigital number, since it uses as much as digits as its factorization.

1313764921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26811543 (or 26811536 counting only the distinct ones).

The product of its digits is 27216, while the sum is 37.

The square root of 1313764921 is about 36245.8952296670. The cubic root of 1313764921 is about 1095.2314019269.

The spelling of 1313764921 in words is "one billion, three hundred thirteen million, seven hundred sixty-four thousand, nine hundred twenty-one".