361289781 has 8 divisors (see below), whose sum is σ = 535244160. Its totient is φ = 240859836.

The previous prime is 361289767. The next prime is 361289791. The reversal of 361289781 is 187982163.

361289781 is a `hidden beast` number, since 361 + 289 + 7 + 8 + 1 = 666.

It is not a de Polignac number, because 361289781 - 2⁵ = 361289749 is a prime.

It is a super-2 number, since 2×361289781² = 261060611710055922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (361289791) 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 in 7 ways as a sum of consecutive naturals, for example, 6690525 + ... + 6690578.

It is an arithmetic number, because the mean of its divisors is an integer number (66905520).

Almost surely, 2^361289781 is an apocalyptic number.

It is an amenable number.

361289781 is a deficient number, since it is larger than the sum of its proper divisors (173954379).

361289781 is a wasteful number, since it uses less digits than its factorization.

361289781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13381112 (or 13381106 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 361289781 is about 19007.6242860595. The cubic root of 361289781 is about 712.2272063726.

The spelling of 361289781 in words is "three hundred sixty-one million, two hundred eighty-nine thousand, seven hundred eighty-one".