161533641 has 4 divisors (see below), whose sum is σ = 215378192. Its totient is φ = 107689092.

The previous prime is 161533633. The next prime is 161533651. The reversal of 161533641 is 146335161.

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 not a de Polignac number, because 161533641 - 2³ = 161533633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161533599 and 161533608.

It is not an unprimeable number, because it can be changed into a prime (161533651) 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, 26922271 + ... + 26922276.

It is an arithmetic number, because the mean of its divisors is an integer number (53844548).

Almost surely, 2^161533641 is an apocalyptic number.

It is an amenable number.

161533641 is a deficient number, since it is larger than the sum of its proper divisors (53844551).

161533641 is an equidigital number, since it uses as much as digits as its factorization.

161533641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53844550.

The product of its digits is 6480, while the sum is 30.

The square root of 161533641 is about 12709.5885456611. The cubic root of 161533641 is about 544.6125698074.

The spelling of 161533641 in words is "one hundred sixty-one million, five hundred thirty-three thousand, six hundred forty-one".