148871993 has 4 divisors (see below), whose sum is σ = 154005540. Its totient is φ = 143738448.

The previous prime is 148871981. The next prime is 148871999. The reversal of 148871993 is 399178841.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399178841 = 827 ⋅482683.

It can be written as a sum of positive squares in 2 ways, for example, as 30780304 + 118091689 = 5548^2 + 10867^2 .

It is a cyclic number.

It is not a de Polignac number, because 148871993 - 2⁶ = 148871929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (148871999) 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, 2566730 + ... + 2566787.

It is an arithmetic number, because the mean of its divisors is an integer number (38501385).

Almost surely, 2^148871993 is an apocalyptic number.

It is an amenable number.

148871993 is a deficient number, since it is larger than the sum of its proper divisors (5133547).

148871993 is an equidigital number, since it uses as much as digits as its factorization.

148871993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5133546.

The product of its digits is 435456, while the sum is 50.

The square root of 148871993 is about 12201.3111180725. The cubic root of 148871993 is about 529.9940583172.

The spelling of 148871993 in words is "one hundred forty-eight million, eight hundred seventy-one thousand, nine hundred ninety-three".