161858859 has 4 divisors (see below), whose sum is σ = 215811816. Its totient is φ = 107905904.

The previous prime is 161858821. The next prime is 161858867. The reversal of 161858859 is 958858161.

161858859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161858859 - 2⁷ = 161858731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161858959) 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, 26976474 + ... + 26976479.

It is an arithmetic number, because the mean of its divisors is an integer number (53952954).

Almost surely, 2^161858859 is an apocalyptic number.

161858859 is a deficient number, since it is larger than the sum of its proper divisors (53952957).

161858859 is an equidigital number, since it uses as much as digits as its factorization.

161858859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53952956.

The product of its digits is 691200, while the sum is 51.

The square root of 161858859 is about 12722.3763110513. The cubic root of 161858859 is about 544.9778169014.

The spelling of 161858859 in words is "one hundred sixty-one million, eight hundred fifty-eight thousand, eight hundred fifty-nine".