363947681 has 2 divisors, whose sum is σ = 363947682. Its totient is φ = 363947680.

The previous prime is 363947677. The next prime is 363947687. The reversal of 363947681 is 186749363.

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., 299290000 + 64657681 = 17300^2 + 8041^2 .

It is a cyclic number.

It is not a de Polignac number, because 363947681 - 2² = 363947677 is a prime.

It is a super-2 number, since 2×363947681² = 264915829010555522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (363947687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181973840 + 181973841.

It is an arithmetic number, because the mean of its divisors is an integer number (181973841).

Almost surely, 2^363947681 is an apocalyptic number.

It is an amenable number.

363947681 is a deficient number, since it is larger than the sum of its proper divisors (1).

363947681 is an equidigital number, since it uses as much as digits as its factorization.

363947681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 47.

The square root of 363947681 is about 19077.4128487067. The cubic root of 363947681 is about 713.9694877989.

The spelling of 363947681 in words is "three hundred sixty-three million, nine hundred forty-seven thousand, six hundred eighty-one".