363638981 has 2 divisors, whose sum is σ = 363638982. Its totient is φ = 363638980.

The previous prime is 363638971. The next prime is 363638983. The reversal of 363638981 is 189836363.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 356832100 + 6806881 = 18890^2 + 2609^2 .

It is a cyclic number.

It is not a de Polignac number, because 363638981 - 2¹⁸ = 363376837 is a prime.

It is a super-2 number, since 2×363638981² = 264466617005436722, which contains 22 as substring.

Together with 363638983, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (363638983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181819490 + 181819491.

It is an arithmetic number, because the mean of its divisors is an integer number (181819491).

Almost surely, 2^363638981 is an apocalyptic number.

It is an amenable number.

363638981 is a deficient number, since it is larger than the sum of its proper divisors (1).

363638981 is an equidigital number, since it uses as much as digits as its factorization.

363638981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 47.

The square root of 363638981 is about 19069.3204126419. The cubic root of 363638981 is about 713.7675680022.

The spelling of 363638981 in words is "three hundred sixty-three million, six hundred thirty-eight thousand, nine hundred eighty-one".