148443781 has 2 divisors, whose sum is σ = 148443782. Its totient is φ = 148443780.

The previous prime is 148443733. The next prime is 148443787. The reversal of 148443781 is 187344841.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81613156 + 66830625 = 9034^2 + 8175^2 .

It is an emirp because it is prime and its reverse (187344841) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 148443781 - 2⁷ = 148443653 is a prime.

It is a super-2 number, since 2×148443781² = 44071112235151922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148443787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74221890 + 74221891.

It is an arithmetic number, because the mean of its divisors is an integer number (74221891).

Almost surely, 2^148443781 is an apocalyptic number.

It is an amenable number.

148443781 is a deficient number, since it is larger than the sum of its proper divisors (1).

148443781 is an equidigital number, since it uses as much as digits as its factorization.

148443781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 40.

The square root of 148443781 is about 12183.7506950856. The cubic root of 148443781 is about 529.4854160551.

The spelling of 148443781 in words is "one hundred forty-eight million, four hundred forty-three thousand, seven hundred eighty-one".