161183601 has 24 divisors (see below), whose sum is σ = 249243904. Its totient is φ = 103984560.

The previous prime is 161183597. The next prime is 161183611. The reversal of 161183601 is 106381161.

It is not a de Polignac number, because 161183601 - 2² = 161183597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161183611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3166 + ... + 18231.

Almost surely, 2^161183601 is an apocalyptic number.

It is an amenable number.

161183601 is a deficient number, since it is larger than the sum of its proper divisors (88060303).

161183601 is an equidigital number, since it uses as much as digits as its factorization.

161183601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21443 (or 21431 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 161183601 is about 12695.8103719298. The cubic root of 161183601 is about 544.2188973185.

The spelling of 161183601 in words is "one hundred sixty-one million, one hundred eighty-three thousand, six hundred one".