365661281 has 2 divisors, whose sum is σ = 365661282. Its totient is φ = 365661280.

The previous prime is 365661271. The next prime is 365661299. The reversal of 365661281 is 182166563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361000000 + 4661281 = 19000^2 + 2159^2 .

It is a cyclic number.

It is not a de Polignac number, because 365661281 - 2¹⁴ = 365644897 is a prime.

It is a super-2 number, since 2×365661281² = 267416344845121922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (365661221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182830640 + 182830641.

It is an arithmetic number, because the mean of its divisors is an integer number (182830641).

Almost surely, 2^365661281 is an apocalyptic number.

It is an amenable number.

365661281 is a deficient number, since it is larger than the sum of its proper divisors (1).

365661281 is an equidigital number, since it uses as much as digits as its factorization.

365661281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 365661281 is about 19122.2718577056. The cubic root of 365661281 is about 715.0882776882.

The spelling of 365661281 in words is "three hundred sixty-five million, six hundred sixty-one thousand, two hundred eighty-one".