1339191857 has 2 divisors, whose sum is σ = 1339191858. Its totient is φ = 1339191856.

The previous prime is 1339191829. The next prime is 1339191869. The reversal of 1339191857 is 7581919331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 782656576 + 556535281 = 27976^2 + 23591^2 .

It is a cyclic number.

It is not a de Polignac number, because 1339191857 - 2¹⁰ = 1339190833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1339191817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669595928 + 669595929.

It is an arithmetic number, because the mean of its divisors is an integer number (669595929).

Almost surely, 2^1339191857 is an apocalyptic number.

It is an amenable number.

1339191857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1339191857 is an equidigital number, since it uses as much as digits as its factorization.

1339191857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 47.

The square root of 1339191857 is about 36594.9703784550. The cubic root of 1339191857 is about 1102.2520959197.

The spelling of 1339191857 in words is "one billion, three hundred thirty-nine million, one hundred ninety-one thousand, eight hundred fifty-seven".