363959821 has 2 divisors, whose sum is σ = 363959822. Its totient is φ = 363959820.

The previous prime is 363959819. The next prime is 363959881. The reversal of 363959821 is 128959363.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213014025 + 150945796 = 14595^2 + 12286^2 .

It is a cyclic number.

It is not a de Polignac number, because 363959821 - 2¹ = 363959819 is a prime.

Together with 363959819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (363959881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181979910 + 181979911.

It is an arithmetic number, because the mean of its divisors is an integer number (181979911).

Almost surely, 2^363959821 is an apocalyptic number.

It is an amenable number.

363959821 is a deficient number, since it is larger than the sum of its proper divisors (1).

363959821 is an equidigital number, since it uses as much as digits as its factorization.

363959821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 46.

The square root of 363959821 is about 19077.7310233686. The cubic root of 363959821 is about 713.9774262048.

The spelling of 363959821 in words is "three hundred sixty-three million, nine hundred fifty-nine thousand, eight hundred twenty-one".