361668581 has 2 divisors, whose sum is σ = 361668582. Its totient is φ = 361668580.

The previous prime is 361668563. The next prime is 361668607. The reversal of 361668581 is 185866163.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247905025 + 113763556 = 15745^2 + 10666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-361668581 is a prime.

It is a super-2 number, since 2×361668581² = 261608324965107122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (361668511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180834290 + 180834291.

It is an arithmetic number, because the mean of its divisors is an integer number (180834291).

Almost surely, 2^361668581 is an apocalyptic number.

It is an amenable number.

361668581 is a deficient number, since it is larger than the sum of its proper divisors (1).

361668581 is an equidigital number, since it uses as much as digits as its factorization.

361668581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 361668581 is about 19017.5860981356. The cubic root of 361668581 is about 712.4760347331.

The spelling of 361668581 in words is "three hundred sixty-one million, six hundred sixty-eight thousand, five hundred eighty-one".