1709121397 has 2 divisors, whose sum is σ = 1709121398. Its totient is φ = 1709121396.

The previous prime is 1709121377. The next prime is 1709121413. The reversal of 1709121397 is 7931219071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1352327076 + 356794321 = 36774^2 + 18889^2 .

It is an emirp because it is prime and its reverse (7931219071) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1709121397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1709121317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 854560698 + 854560699.

It is an arithmetic number, because the mean of its divisors is an integer number (854560699).

Almost surely, 2^1709121397 is an apocalyptic number.

It is an amenable number.

1709121397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1709121397 is an equidigital number, since it uses as much as digits as its factorization.

1709121397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23814, while the sum is 40.

The square root of 1709121397 is about 41341.5214645035. The cubic root of 1709121397 is about 1195.6139412817.

The spelling of 1709121397 in words is "one billion, seven hundred nine million, one hundred twenty-one thousand, three hundred ninety-seven".