38613221 has 2 divisors, whose sum is σ = 38613222. Its totient is φ = 38613220.

The previous prime is 38613217. The next prime is 38613241. The reversal of 38613221 is 12231683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32433025 + 6180196 = 5695^2 + 2486^2 .

It is a cyclic number.

It is not a de Polignac number, because 38613221 - 2² = 38613217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38613241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19306610 + 19306611.

It is an arithmetic number, because the mean of its divisors is an integer number (19306611).

Almost surely, 2^38613221 is an apocalyptic number.

It is an amenable number.

38613221 is a deficient number, since it is larger than the sum of its proper divisors (1).

38613221 is an equidigital number, since it uses as much as digits as its factorization.

38613221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 38613221 is about 6213.9537333327. The cubic root of 38613221 is about 337.9963498783.

The spelling of 38613221 in words is "thirty-eight million, six hundred thirteen thousand, two hundred twenty-one".