38551661 has 2 divisors, whose sum is σ = 38551662. Its totient is φ = 38551660.

The previous prime is 38551633. The next prime is 38551691. The reversal of 38551661 is 16615583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24157225 + 14394436 = 4915^2 + 3794^2 .

It is a cyclic number.

It is not a de Polignac number, because 38551661 - 2¹⁰ = 38550637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38551621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19275830 + 19275831.

It is an arithmetic number, because the mean of its divisors is an integer number (19275831).

Almost surely, 2^38551661 is an apocalyptic number.

It is an amenable number.

38551661 is a deficient number, since it is larger than the sum of its proper divisors (1).

38551661 is an equidigital number, since it uses as much as digits as its factorization.

38551661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The square root of 38551661 is about 6208.9983894345. The cubic root of 38551661 is about 337.8166349004.

The spelling of 38551661 in words is "thirty-eight million, five hundred fifty-one thousand, six hundred sixty-one".