84155861 has 4 divisors (see below), whose sum is σ = 84348000. Its totient is φ = 83963724.

The previous prime is 84155857. The next prime is 84155867. The reversal of 84155861 is 16855148.

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 a cyclic number.

It is not a de Polignac number, because 84155861 - 2² = 84155857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84155867) 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, 95411 + ... + 96288.

It is an arithmetic number, because the mean of its divisors is an integer number (21087000).

Almost surely, 2^84155861 is an apocalyptic number.

It is an amenable number.

84155861 is a deficient number, since it is larger than the sum of its proper divisors (192139).

84155861 is a wasteful number, since it uses less digits than its factorization.

84155861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192138.

The product of its digits is 38400, while the sum is 38.

The square root of 84155861 is about 9173.6503639500. The cubic root of 84155861 is about 438.2226181492. Note that the first 3 decimals are identical.

The spelling of 84155861 in words is "eighty-four million, one hundred fifty-five thousand, eight hundred sixty-one".