361643821 has 16 divisors (see below), whose sum is σ = 461881728. Its totient is φ = 274924800.

The previous prime is 361643773. The next prime is 361643837. The reversal of 361643821 is 128346163.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 361643821 - 2⁷ = 361643693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (361640821) 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 in 15 ways as a sum of consecutive naturals, for example, 54120 + ... + 60433.

It is an arithmetic number, because the mean of its divisors is an integer number (28867608).

Almost surely, 2^361643821 is an apocalyptic number.

It is an amenable number.

361643821 is a deficient number, since it is larger than the sum of its proper divisors (100237907).

361643821 is a wasteful number, since it uses less digits than its factorization.

361643821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114612.

The product of its digits is 20736, while the sum is 34.

The square root of 361643821 is about 19016.9351105797. The cubic root of 361643821 is about 712.4597755480.

Adding to 361643821 its reverse (128346163), we get a palindrome (489989984).

The spelling of 361643821 in words is "three hundred sixty-one million, six hundred forty-three thousand, eight hundred twenty-one".