38551681 has 9 divisors (see below), whose sum is σ = 44896449. Its totient is φ = 33007044.

The previous prime is 38551661. The next prime is 38551691. The reversal of 38551681 is 18615583.

The square root of 38551681 is 6209.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 38551681 - 2⁷ = 38551553 is a prime.

It is a super-2 number, since 2×38551681² = 2972464215851522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38551681.

It is not an unprimeable number, because it can be changed into a prime (38551621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43020 + ... + 43906.

Almost surely, 2^38551681 is an apocalyptic number.

38551681 is the 6209-th square number.

38551681 is the 3105-th centered octagonal number.

It is an amenable number.

38551681 is a deficient number, since it is larger than the sum of its proper divisors (6344768).

38551681 is an frugal number, since it uses more digits than its factorization.

38551681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788 (or 894 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The cubic root of 38551681 is about 337.8166933184.

The spelling of 38551681 in words is "thirty-eight million, five hundred fifty-one thousand, six hundred eighty-one".