148780781 has 2 divisors, whose sum is σ = 148780782. Its totient is φ = 148780780.

The previous prime is 148780771. The next prime is 148780829. The reversal of 148780781 is 187087841.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146652100 + 2128681 = 12110^2 + 1459^2 .

It is a cyclic number.

It is not a de Polignac number, because 148780781 - 2¹⁴ = 148764397 is a prime.

It is a super-2 number, since 2×148780781² = 44271441589939922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148780771) 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 as a sum of consecutive naturals, namely, 74390390 + 74390391.

It is an arithmetic number, because the mean of its divisors is an integer number (74390391).

Almost surely, 2^148780781 is an apocalyptic number.

It is an amenable number.

148780781 is a deficient number, since it is larger than the sum of its proper divisors (1).

148780781 is an equidigital number, since it uses as much as digits as its factorization.

148780781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100352, while the sum is 44.

The square root of 148780781 is about 12197.5727503467. The cubic root of 148780781 is about 529.8857959699.

The spelling of 148780781 in words is "one hundred forty-eight million, seven hundred eighty thousand, seven hundred eighty-one".