164107561 has 4 divisors (see below), whose sum is σ = 164304000. Its totient is φ = 163911124.

The previous prime is 164107523. The next prime is 164107609. The reversal of 164107561 is 165701461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165701461 = 47 ⋅3525563.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164107561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164107061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96961 + ... + 98638.

It is an arithmetic number, because the mean of its divisors is an integer number (41076000).

Almost surely, 2^164107561 is an apocalyptic number.

It is an amenable number.

164107561 is a deficient number, since it is larger than the sum of its proper divisors (196439).

164107561 is an equidigital number, since it uses as much as digits as its factorization.

164107561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196438.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 164107561 is about 12810.4473380128. The cubic root of 164107561 is about 547.4900073932.

The spelling of 164107561 in words is "one hundred sixty-four million, one hundred seven thousand, five hundred sixty-one".