38542981 has 2 divisors, whose sum is σ = 38542982. Its totient is φ = 38542980.

The previous prime is 38542979. The next prime is 38542991. The reversal of 38542981 is 18924583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35212356 + 3330625 = 5934^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 38542981 - 2¹ = 38542979 is a prime.

It is a super-2 number, since 2×38542981² = 2971122768732722, which contains 22 as substring.

Together with 38542979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38542991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19271490 + 19271491.

It is an arithmetic number, because the mean of its divisors is an integer number (19271491).

Almost surely, 2^38542981 is an apocalyptic number.

It is an amenable number.

38542981 is a deficient number, since it is larger than the sum of its proper divisors (1).

38542981 is an equidigital number, since it uses as much as digits as its factorization.

38542981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 38542981 is about 6208.2993645603. The cubic root of 38542981 is about 337.7912795857.

The spelling of 38542981 in words is "thirty-eight million, five hundred forty-two thousand, nine hundred eighty-one".