161564401 has 8 divisors (see below), whose sum is σ = 164528000. Its totient is φ = 158623920.

The previous prime is 161564399. The next prime is 161564437. The reversal of 161564401 is 104465161.

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 161564401 - 2¹ = 161564399 is a prime.

It is a super-2 number, since 2×161564401² = 52206111340977602, which contains 22 as substring.

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 161564401.

It is not an unprimeable number, because it can be changed into a prime (161564441) 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 7 ways as a sum of consecutive naturals, for example, 8650 + ... + 19948.

It is an arithmetic number, because the mean of its divisors is an integer number (20566000).

Almost surely, 2^161564401 is an apocalyptic number.

It is an amenable number.

161564401 is a deficient number, since it is larger than the sum of its proper divisors (2963599).

161564401 is a wasteful number, since it uses less digits than its factorization.

161564401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11559.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 161564401 is about 12710.7985980425. The cubic root of 161564401 is about 544.6471368472.

The spelling of 161564401 in words is "one hundred sixty-one million, five hundred sixty-four thousand, four hundred one".