161544001 has 4 divisors (see below), whose sum is σ = 161685504. Its totient is φ = 161402500.

The previous prime is 161543981. The next prime is 161544017. The reversal of 161544001 is 100445161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161544001 - 2⁹ = 161543489 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161544101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69025 + ... + 71326.

It is an arithmetic number, because the mean of its divisors is an integer number (40421376).

Almost surely, 2^161544001 is an apocalyptic number.

It is an amenable number.

161544001 is a deficient number, since it is larger than the sum of its proper divisors (141503).

161544001 is a wasteful number, since it uses less digits than its factorization.

161544001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141502.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 161544001 is about 12709.9961054282. The cubic root of 161544001 is about 544.6242125124.

Adding to 161544001 its reverse (100445161), we get a palindrome (261989162).

The spelling of 161544001 in words is "one hundred sixty-one million, five hundred forty-four thousand, one".