148765561 has 4 divisors (see below), whose sum is σ = 170017792. Its totient is φ = 127513332.

The previous prime is 148765553. The next prime is 148765571. The reversal of 148765561 is 165567841.

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 148765561 - 2³ = 148765553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (148765501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10626105 + ... + 10626118.

It is an arithmetic number, because the mean of its divisors is an integer number (42504448).

Almost surely, 2^148765561 is an apocalyptic number.

It is an amenable number.

148765561 is a deficient number, since it is larger than the sum of its proper divisors (21252231).

148765561 is an equidigital number, since it uses as much as digits as its factorization.

148765561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21252230.

The product of its digits is 201600, while the sum is 43.

The square root of 148765561 is about 12196.9488397714. The cubic root of 148765561 is about 529.8677265732.

The spelling of 148765561 in words is "one hundred forty-eight million, seven hundred sixty-five thousand, five hundred sixty-one".