161186401 has 8 divisors (see below), whose sum is σ = 173073024. Its totient is φ = 149567040.

The previous prime is 161186383. The next prime is 161186413. The reversal of 161186401 is 104681161.

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

It is a cyclic number.

It is not a de Polignac number, because 161186401 - 2⁷ = 161186273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161186401.

It is not an unprimeable number, because it can be changed into a prime (161186471) 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, 65565 + ... + 67978.

It is an arithmetic number, because the mean of its divisors is an integer number (21634128).

Almost surely, 2^161186401 is an apocalyptic number.

It is an amenable number.

161186401 is a deficient number, since it is larger than the sum of its proper divisors (11886623).

161186401 is a wasteful number, since it uses less digits than its factorization.

161186401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133631.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 161186401 is about 12695.9206440494. The cubic root of 161186401 is about 544.2220485987. Note that the first 3 decimals are identical.

The spelling of 161186401 in words is "one hundred sixty-one million, one hundred eighty-six thousand, four hundred one".