1366398541 has 2 divisors, whose sum is σ = 1366398542. Its totient is φ = 1366398540.

The previous prime is 1366398521. The next prime is 1366398557. The reversal of 1366398541 is 1458936631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1341097641 + 25300900 = 36621^2 + 5030^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366398541 - 2⁷ = 1366398413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1366398491 and 1366398500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1366398521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683199270 + 683199271.

It is an arithmetic number, because the mean of its divisors is an integer number (683199271).

Almost surely, 2^1366398541 is an apocalyptic number.

It is an amenable number.

1366398541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366398541 is an equidigital number, since it uses as much as digits as its factorization.

1366398541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 46.

The square root of 1366398541 is about 36964.8284319027. The cubic root of 1366398541 is about 1109.6664693339. Note that the first 3 decimals are identical.

The spelling of 1366398541 in words is "one billion, three hundred sixty-six million, three hundred ninety-eight thousand, five hundred forty-one".