84011861 has 2 divisors, whose sum is σ = 84011862. Its totient is φ = 84011860.

The previous prime is 84011857. The next prime is 84011887. The reversal of 84011861 is 16811048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82700836 + 1311025 = 9094^2 + 1145^2 .

It is a cyclic number.

It is not a de Polignac number, because 84011861 - 2² = 84011857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84011821) 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, 42005930 + 42005931.

It is an arithmetic number, because the mean of its divisors is an integer number (42005931).

Almost surely, 2^84011861 is an apocalyptic number.

It is an amenable number.

84011861 is a deficient number, since it is larger than the sum of its proper divisors (1).

84011861 is an equidigital number, since it uses as much as digits as its factorization.

84011861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 84011861 is about 9165.7984376703. The cubic root of 84011861 is about 437.9725263030.

The spelling of 84011861 in words is "eighty-four million, eleven thousand, eight hundred sixty-one".