84612181 has 2 divisors, whose sum is σ = 84612182. Its totient is φ = 84612180.

The previous prime is 84612127. The next prime is 84612257. The reversal of 84612181 is 18121648.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80389156 + 4223025 = 8966^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 84612181 - 2¹³ = 84603989 is a prime.

It is a super-2 number, since 2×84612181² = 14318442347153522, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84610181) 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, 42306090 + 42306091.

It is an arithmetic number, because the mean of its divisors is an integer number (42306091).

Almost surely, 2^84612181 is an apocalyptic number.

It is an amenable number.

84612181 is a deficient number, since it is larger than the sum of its proper divisors (1).

84612181 is an equidigital number, since it uses as much as digits as its factorization.

84612181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 31.

The square root of 84612181 is about 9198.4879735748. The cubic root of 84612181 is about 439.0132519181.

The spelling of 84612181 in words is "eighty-four million, six hundred twelve thousand, one hundred eighty-one".