148839681 has 4 divisors (see below), whose sum is σ = 198452912. Its totient is φ = 99226452.

The previous prime is 148839679. The next prime is 148839683. The reversal of 148839681 is 186938841.

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: 186938841 = 3 ⋅62312947.

It is an interprime number because it is at equal distance from previous prime (148839679) and next prime (148839683).

It is not a de Polignac number, because 148839681 - 2¹ = 148839679 is a prime.

It is a super-2 number, since 2×148839681² = 44306501280363522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 148839681.

It is not an unprimeable number, because it can be changed into a prime (148839683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24806611 + ... + 24806616.

It is an arithmetic number, because the mean of its divisors is an integer number (49613228).

Almost surely, 2^148839681 is an apocalyptic number.

It is an amenable number.

148839681 is a deficient number, since it is larger than the sum of its proper divisors (49613231).

148839681 is an equidigital number, since it uses as much as digits as its factorization.

148839681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49613230.

The product of its digits is 331776, while the sum is 48.

The square root of 148839681 is about 12199.9869262225. The cubic root of 148839681 is about 529.9557112630.

The spelling of 148839681 in words is "one hundred forty-eight million, eight hundred thirty-nine thousand, six hundred eighty-one".