1319139817 has 2 divisors, whose sum is σ = 1319139818. Its totient is φ = 1319139816.

The previous prime is 1319139793. The next prime is 1319139839. The reversal of 1319139817 is 7189319131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1258049961 + 61089856 = 35469^2 + 7816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1319139817 is a prime.

It is not a weakly prime, because it can be changed into another prime (1319139517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659569908 + 659569909.

It is an arithmetic number, because the mean of its divisors is an integer number (659569909).

Almost surely, 2^1319139817 is an apocalyptic number.

It is an amenable number.

1319139817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1319139817 is an equidigital number, since it uses as much as digits as its factorization.

1319139817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 43.

The square root of 1319139817 is about 36319.9644410619. The cubic root of 1319139817 is about 1096.7229790448.

The spelling of 1319139817 in words is "one billion, three hundred nineteen million, one hundred thirty-nine thousand, eight hundred seventeen".