148805561 has 4 divisors (see below), whose sum is σ = 155275392. Its totient is φ = 142335732.

The previous prime is 148805543. The next prime is 148805567. The reversal of 148805561 is 165508841.

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: 165508841 = 41 ⋅4036801.

It is a cyclic number.

It is not a de Polignac number, because 148805561 - 2⁶ = 148805497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (148805567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3234881 + ... + 3234926.

It is an arithmetic number, because the mean of its divisors is an integer number (38818848).

Almost surely, 2^148805561 is an apocalyptic number.

It is an amenable number.

148805561 is a deficient number, since it is larger than the sum of its proper divisors (6469831).

148805561 is an equidigital number, since it uses as much as digits as its factorization.

148805561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6469830.

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 148805561 is about 12198.5884839189. The cubic root of 148805561 is about 529.9152124958.

It can be divided in two parts, 14880 and 5561, that multiplied together give a triangular number (82747680 = T₁₂₈₆₄).

The spelling of 148805561 in words is "one hundred forty-eight million, eight hundred five thousand, five hundred sixty-one".