148559981 has 2 divisors, whose sum is σ = 148559982. Its totient is φ = 148559980.

The previous prime is 148559959. The next prime is 148560017. The reversal of 148559981 is 189955841.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146627881 + 1932100 = 12109^2 + 1390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-148559981 is a prime.

It is a super-2 number, since 2×148559981² = 44140135909440722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148559911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74279990 + 74279991.

It is an arithmetic number, because the mean of its divisors is an integer number (74279991).

Almost surely, 2^148559981 is an apocalyptic number.

It is an amenable number.

148559981 is a deficient number, since it is larger than the sum of its proper divisors (1).

148559981 is an equidigital number, since it uses as much as digits as its factorization.

148559981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 50.

The square root of 148559981 is about 12188.5184087320. The cubic root of 148559981 is about 529.6235382854.

The spelling of 148559981 in words is "one hundred forty-eight million, five hundred fifty-nine thousand, nine hundred eighty-one".