1368085921 has 2 divisors, whose sum is σ = 1368085922. Its totient is φ = 1368085920.

The previous prime is 1368085913. The next prime is 1368085967. The reversal of 1368085921 is 1295808631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1262736225 + 105349696 = 35535^2 + 10264^2 .

It is a cyclic number.

It is not a de Polignac number, because 1368085921 - 2³ = 1368085913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1368085981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684042960 + 684042961.

It is an arithmetic number, because the mean of its divisors is an integer number (684042961).

Almost surely, 2^1368085921 is an apocalyptic number.

It is an amenable number.

1368085921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1368085921 is an equidigital number, since it uses as much as digits as its factorization.

1368085921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 1368085921 is about 36987.6455184701. The cubic root of 1368085921 is about 1110.1230610526.

The spelling of 1368085921 in words is "one billion, three hundred sixty-eight million, eighty-five thousand, nine hundred twenty-one".