161784861 has 8 divisors (see below), whose sum is σ = 246529344. Its totient is φ = 92448480.

The previous prime is 161784853. The next prime is 161784899. The reversal of 161784861 is 168487161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161784861 - 2³ = 161784853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161784851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3852000 + ... + 3852041.

It is an arithmetic number, because the mean of its divisors is an integer number (30816168).

Almost surely, 2^161784861 is an apocalyptic number.

It is an amenable number.

161784861 is a deficient number, since it is larger than the sum of its proper divisors (84744483).

161784861 is an equidigital number, since it uses as much as digits as its factorization.

161784861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7704051.

The product of its digits is 64512, while the sum is 42.

The square root of 161784861 is about 12719.4677954701. The cubic root of 161784861 is about 544.8947539665.

The spelling of 161784861 in words is "one hundred sixty-one million, seven hundred eighty-four thousand, eight hundred sixty-one".