1366574549 has 2 divisors, whose sum is σ = 1366574550. Its totient is φ = 1366574548.

The previous prime is 1366574543. The next prime is 1366574609. The reversal of 1366574549 is 9454756631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1128489649 + 238084900 = 33593^2 + 15430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366574549 - 2⁴ = 1366574533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1366574497 and 1366574506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1366574543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683287274 + 683287275.

It is an arithmetic number, because the mean of its divisors is an integer number (683287275).

Almost surely, 2^1366574549 is an apocalyptic number.

It is an amenable number.

1366574549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366574549 is an equidigital number, since it uses as much as digits as its factorization.

1366574549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 50.

The square root of 1366574549 is about 36967.2091048269. The cubic root of 1366574549 is about 1109.7141132642.

The spelling of 1366574549 in words is "one billion, three hundred sixty-six million, five hundred seventy-four thousand, five hundred forty-nine".