84033981 has 6 divisors (see below), whose sum is σ = 121382430. Its totient is φ = 56022648.

The previous prime is 84033923. The next prime is 84034001. The reversal of 84033981 is 18933048.

It can be written as a sum of positive squares in only one way, i.e., 83557881 + 476100 = 9141^2 + 690^2 .

It is not a de Polignac number, because 84033981 - 2¹⁵ = 84001213 is a prime.

It is a super-2 number, since 2×84033981² = 14123419925416722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84033581) 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 in 5 ways as a sum of consecutive naturals, for example, 4668546 + ... + 4668563.

It is an arithmetic number, because the mean of its divisors is an integer number (20230405).

Almost surely, 2^84033981 is an apocalyptic number.

It is an amenable number.

84033981 is a deficient number, since it is larger than the sum of its proper divisors (37348449).

84033981 is a wasteful number, since it uses less digits than its factorization.

84033981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9337115 (or 9337112 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 84033981 is about 9167.0050179980. The cubic root of 84033981 is about 438.0109617573.

The spelling of 84033981 in words is "eighty-four million, thirty-three thousand, nine hundred eighty-one".