35531981 has 2 divisors, whose sum is σ = 35531982. Its totient is φ = 35531980.

The previous prime is 35531963. The next prime is 35532011. The reversal of 35531981 is 18913553.

35531981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34703881 + 828100 = 5891^2 + 910^2 .

It is a cyclic number.

It is not a de Polignac number, because 35531981 - 2⁶ = 35531917 is a prime.

It is a super-2 number, since 2×35531981² = 2525043347568722, which contains 22 as substring.

It is equal to p_2177369 and since 35531981 and 2177369 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (35531281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17765990 + 17765991.

It is an arithmetic number, because the mean of its divisors is an integer number (17765991).

Almost surely, 2^35531981 is an apocalyptic number.

It is an amenable number.

35531981 is a deficient number, since it is larger than the sum of its proper divisors (1).

35531981 is an equidigital number, since it uses as much as digits as its factorization.

35531981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 35.

The square root of 35531981 is about 5960.8708256428. The cubic root of 35531981 is about 328.7555856926.

The spelling of 35531981 in words is "thirty-five million, five hundred thirty-one thousand, nine hundred eighty-one".