361687861 has 2 divisors, whose sum is σ = 361687862. Its totient is φ = 361687860.

The previous prime is 361687853. The next prime is 361687883. The reversal of 361687861 is 168786163.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 343360900 + 18326961 = 18530^2 + 4281^2 .

It is a cyclic number.

It is not a de Polignac number, because 361687861 - 2³ = 361687853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (361687831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180843930 + 180843931.

It is an arithmetic number, because the mean of its divisors is an integer number (180843931).

Almost surely, 2^361687861 is an apocalyptic number.

It is an amenable number.

361687861 is a deficient number, since it is larger than the sum of its proper divisors (1).

361687861 is an equidigital number, since it uses as much as digits as its factorization.

361687861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 361687861 is about 19018.0929906234. The cubic root of 361687861 is about 712.4886948447.

The spelling of 361687861 in words is "three hundred sixty-one million, six hundred eighty-seven thousand, eight hundred sixty-one".