38815661 has 2 divisors, whose sum is σ = 38815662. Its totient is φ = 38815660.

The previous prime is 38815649. The next prime is 38815669. The reversal of 38815661 is 16651883.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24940036 + 13875625 = 4994^2 + 3725^2 .

It is a cyclic number.

It is not a de Polignac number, because 38815661 - 2¹⁰ = 38814637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38815669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19407830 + 19407831.

It is an arithmetic number, because the mean of its divisors is an integer number (19407831).

Almost surely, 2^38815661 is an apocalyptic number.

It is an amenable number.

38815661 is a deficient number, since it is larger than the sum of its proper divisors (1).

38815661 is an equidigital number, since it uses as much as digits as its factorization.

38815661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 38.

The square root of 38815661 is about 6230.2215851445. The cubic root of 38815661 is about 338.5859989626.

The spelling of 38815661 in words is "thirty-eight million, eight hundred fifteen thousand, six hundred sixty-one".