1315779109 has 4 divisors (see below), whose sum is σ = 1316593440. Its totient is φ = 1314964780.

The previous prime is 1315779079. The next prime is 1315779131. The reversal of 1315779109 is 9019775131.

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 1315779109 - 2⁵ = 1315779077 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 (1315779149) 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, 404737 + ... + 407974.

It is an arithmetic number, because the mean of its divisors is an integer number (329148360).

Almost surely, 2^1315779109 is an apocalyptic number.

It is an amenable number.

1315779109 is a deficient number, since it is larger than the sum of its proper divisors (814331).

1315779109 is an equidigital number, since it uses as much as digits as its factorization.

1315779109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814330.

The product of its (nonzero) digits is 59535, while the sum is 43.

The square root of 1315779109 is about 36273.6696379068. The cubic root of 1315779109 is about 1095.7908311672.

The spelling of 1315779109 in words is "one billion, three hundred fifteen million, seven hundred seventy-nine thousand, one hundred nine".