84166981 has 4 divisors (see below), whose sum is σ = 85593600. Its totient is φ = 82740364.

The previous prime is 84166969. The next prime is 84166993. The reversal of 84166981 is 18966148.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (84166969) and next prime (84166993).

It is a cyclic number.

It is not a de Polignac number, because 84166981 - 2⁷ = 84166853 is a prime.

It is a super-2 number, since 2×84166981² = 14168161381308722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84166921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713221 + ... + 713338.

It is an arithmetic number, because the mean of its divisors is an integer number (21398400).

Almost surely, 2^84166981 is an apocalyptic number.

It is an amenable number.

84166981 is a deficient number, since it is larger than the sum of its proper divisors (1426619).

84166981 is a wasteful number, since it uses less digits than its factorization.

84166981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426618.

The product of its digits is 82944, while the sum is 43.

The square root of 84166981 is about 9174.2564276349. The cubic root of 84166981 is about 438.2419189277.

The spelling of 84166981 in words is "eighty-four million, one hundred sixty-six thousand, nine hundred eighty-one".