38161681 has 2 divisors, whose sum is σ = 38161682. Its totient is φ = 38161680.

The previous prime is 38161667. The next prime is 38161703. The reversal of 38161681 is 18616183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37454400 + 707281 = 6120^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 38161681 - 2⁵ = 38161649 is a prime.

It is a super-2 number, since 2×38161681² = 2912627793491522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38161601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19080840 + 19080841.

It is an arithmetic number, because the mean of its divisors is an integer number (19080841).

Almost surely, 2^38161681 is an apocalyptic number.

It is an amenable number.

38161681 is a deficient number, since it is larger than the sum of its proper divisors (1).

38161681 is an equidigital number, since it uses as much as digits as its factorization.

38161681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 38161681 is about 6177.5141440550. The cubic root of 38161681 is about 336.6736796674.

The spelling of 38161681 in words is "thirty-eight million, one hundred sixty-one thousand, six hundred eighty-one".