161145601 has 16 divisors (see below), whose sum is σ = 173905920. Its totient is φ = 148780800.

The previous prime is 161145497. The next prime is 161145617. The reversal of 161145601 is 106541161.

It is a cyclic number.

It is not a de Polignac number, because 161145601 - 2⁷ = 161145473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161145661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217690 + ... + 218428.

It is an arithmetic number, because the mean of its divisors is an integer number (10869120).

Almost surely, 2^161145601 is an apocalyptic number.

It is an amenable number.

161145601 is a deficient number, since it is larger than the sum of its proper divisors (12760319).

161145601 is a wasteful number, since it uses less digits than its factorization.

161145601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 161145601 is about 12694.3137270197. The cubic root of 161145601 is about 544.1761263349.

Adding to 161145601 its reverse (106541161), we get a palindrome (267686762).

The spelling of 161145601 in words is "one hundred sixty-one million, one hundred forty-five thousand, six hundred one".