84146981 has 2 divisors, whose sum is σ = 84146982. Its totient is φ = 84146980.

The previous prime is 84146971. The next prime is 84147013. The reversal of 84146981 is 18964148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84088900 + 58081 = 9170^2 + 241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84146981 is a prime.

It is a super-2 number, since 2×84146981² = 14161428822828722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84146911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42073490 + 42073491.

It is an arithmetic number, because the mean of its divisors is an integer number (42073491).

Almost surely, 2^84146981 is an apocalyptic number.

It is an amenable number.

84146981 is a deficient number, since it is larger than the sum of its proper divisors (1).

84146981 is an equidigital number, since it uses as much as digits as its factorization.

84146981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 41.

The square root of 84146981 is about 9173.1663562807. The cubic root of 84146981 is about 438.2072040763.

The spelling of 84146981 in words is "eighty-four million, one hundred forty-six thousand, nine hundred eighty-one".