365206561 has 2 divisors, whose sum is σ = 365206562. Its totient is φ = 365206560.

The previous prime is 365206547. The next prime is 365206577. The reversal of 365206561 is 165602563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362178961 + 3027600 = 19031^2 + 1740^2 .

It is a cyclic number.

It is not a de Polignac number, because 365206561 - 2⁷ = 365206433 is a prime.

It is not a weakly prime, because it can be changed into another prime (365206511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182603280 + 182603281.

It is an arithmetic number, because the mean of its divisors is an integer number (182603281).

Almost surely, 2^365206561 is an apocalyptic number.

It is an amenable number.

365206561 is a deficient number, since it is larger than the sum of its proper divisors (1).

365206561 is an equidigital number, since it uses as much as digits as its factorization.

365206561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 365206561 is about 19110.3783583685. The cubic root of 365206561 is about 714.7917374759.

The spelling of 365206561 in words is "three hundred sixty-five million, two hundred six thousand, five hundred sixty-one".