148441781 has 4 divisors (see below), whose sum is σ = 149057964. Its totient is φ = 147825600.

The previous prime is 148441751. The next prime is 148441801. The reversal of 148441781 is 187144841.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187144841 = 13 ⋅14395757.

It can be written as a sum of positive squares in 2 ways, for example, as 91680625 + 56761156 = 9575^2 + 7534^2 .

It is a cyclic number.

It is not a de Polignac number, because 148441781 - 2⁶ = 148441717 is a prime.

It is a super-2 number, since 2×148441781² = 44069924692903922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148441721) 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, 307730 + ... + 308211.

It is an arithmetic number, because the mean of its divisors is an integer number (37264491).

Almost surely, 2^148441781 is an apocalyptic number.

It is an amenable number.

148441781 is a deficient number, since it is larger than the sum of its proper divisors (616183).

148441781 is an equidigital number, since it uses as much as digits as its factorization.

148441781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616182.

The product of its digits is 28672, while the sum is 38.

The square root of 148441781 is about 12183.6686182775. The cubic root of 148441781 is about 529.4830381052.

The spelling of 148441781 in words is "one hundred forty-eight million, four hundred forty-one thousand, seven hundred eighty-one".