1366139417 has 2 divisors, whose sum is σ = 1366139418. Its totient is φ = 1366139416.

The previous prime is 1366139371. The next prime is 1366139443. The reversal of 1366139417 is 7149316631.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1343662336 + 22477081 = 36656^2 + 4741^2 .

It is an emirp because it is prime and its reverse (7149316631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1366139417 - 2¹⁰ = 1366138393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1366139317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683069708 + 683069709.

It is an arithmetic number, because the mean of its divisors is an integer number (683069709).

Almost surely, 2^1366139417 is an apocalyptic number.

It is an amenable number.

1366139417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366139417 is an equidigital number, since it uses as much as digits as its factorization.

1366139417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 1366139417 is about 36961.3232582385. The cubic root of 1366139417 is about 1109.5963191340.

The spelling of 1366139417 in words is "one billion, three hundred sixty-six million, one hundred thirty-nine thousand, four hundred seventeen".