148565551 has 4 divisors (see below), whose sum is σ = 148718592. Its totient is φ = 148412512.

The previous prime is 148565531. The next prime is 148565587. The reversal of 148565551 is 155565841.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155565841 = 593 ⋅262337.

It is a cyclic number.

It is not a de Polignac number, because 148565551 - 2¹³ = 148557359 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148565531) 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, 75055 + ... + 77008.

It is an arithmetic number, because the mean of its divisors is an integer number (37179648).

Almost surely, 2^148565551 is an apocalyptic number.

148565551 is a deficient number, since it is larger than the sum of its proper divisors (153041).

148565551 is an equidigital number, since it uses as much as digits as its factorization.

148565551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153040.

The product of its digits is 120000, while the sum is 40.

The square root of 148565551 is about 12188.7469003175. The cubic root of 148565551 is about 529.6301573094.

The spelling of 148565551 in words is "one hundred forty-eight million, five hundred sixty-five thousand, five hundred fifty-one".