1366534921 has 2 divisors, whose sum is σ = 1366534922. Its totient is φ = 1366534920.

The previous prime is 1366534837. The next prime is 1366534951. The reversal of 1366534921 is 1294356631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1353430521 + 13104400 = 36789^2 + 3620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366534921 - 2²¹ = 1364437769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1366534951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683267460 + 683267461.

It is an arithmetic number, because the mean of its divisors is an integer number (683267461).

Almost surely, 2^1366534921 is an apocalyptic number.

It is an amenable number.

1366534921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366534921 is an equidigital number, since it uses as much as digits as its factorization.

1366534921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The square root of 1366534921 is about 36966.6731124130. The cubic root of 1366534921 is about 1109.7033866446.

The spelling of 1366534921 in words is "one billion, three hundred sixty-six million, five hundred thirty-four thousand, nine hundred twenty-one".