1313331779 has 2 divisors, whose sum is σ = 1313331780. Its totient is φ = 1313331778.

The previous prime is 1313331727. The next prime is 1313331781. The reversal of 1313331779 is 9771333131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313331779 is a prime.

Together with 1313331781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1313331079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656665889 + 656665890.

It is an arithmetic number, because the mean of its divisors is an integer number (656665890).

Almost surely, 2^1313331779 is an apocalyptic number.

1313331779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313331779 is an equidigital number, since it uses as much as digits as its factorization.

1313331779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35721, while the sum is 38.

The square root of 1313331779 is about 36239.9196881009. The cubic root of 1313331779 is about 1095.1110245147. Note that the first 3 decimals are identical.

The spelling of 1313331779 in words is "one billion, three hundred thirteen million, three hundred thirty-one thousand, seven hundred seventy-nine".