38631453221 has 2 divisors, whose sum is σ = 38631453222. Its totient is φ = 38631453220.

The previous prime is 38631453199. The next prime is 38631453271. The reversal of 38631453221 is 12235413683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26369212996 + 12262240225 = 162386^2 + 110735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38631453221 is a prime.

It is a super-2 number, since 2×38631453221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38631453271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19315726610 + 19315726611.

It is an arithmetic number, because the mean of its divisors is an integer number (19315726611).

Almost surely, 2^38631453221 is an apocalyptic number.

It is an amenable number.

38631453221 is a deficient number, since it is larger than the sum of its proper divisors (1).

38631453221 is an equidigital number, since it uses as much as digits as its factorization.

38631453221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 38.

The spelling of 38631453221 in words is "thirty-eight billion, six hundred thirty-one million, four hundred fifty-three thousand, two hundred twenty-one".