361505491 has 2 divisors, whose sum is σ = 361505492. Its totient is φ = 361505490.

The previous prime is 361505489. The next prime is 361505497. The reversal of 361505491 is 194505163.

It is a weak prime.

It is an emirp because it is prime and its reverse (194505163) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 361505491 - 2¹ = 361505489 is a prime.

Together with 361505489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (361505497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180752745 + 180752746.

It is an arithmetic number, because the mean of its divisors is an integer number (180752746).

Almost surely, 2^361505491 is an apocalyptic number.

361505491 is a deficient number, since it is larger than the sum of its proper divisors (1).

361505491 is an equidigital number, since it uses as much as digits as its factorization.

361505491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 361505491 is about 19013.2977413178. The cubic root of 361505491 is about 712.3689245287.

The spelling of 361505491 in words is "three hundred sixty-one million, five hundred five thousand, four hundred ninety-one".