149985281 has 2 divisors, whose sum is σ = 149985282. Its totient is φ = 149985280.

The previous prime is 149985263. The next prime is 149985293. The reversal of 149985281 is 182589941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76300225 + 73685056 = 8735^2 + 8584^2 .

It is a cyclic number.

It is not a de Polignac number, because 149985281 - 2¹⁸ = 149723137 is a prime.

It is a super-2 number, since 2×149985281² = 44991169033297922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (149985211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74992640 + 74992641.

It is an arithmetic number, because the mean of its divisors is an integer number (74992641).

Almost surely, 2^149985281 is an apocalyptic number.

It is an amenable number.

149985281 is a deficient number, since it is larger than the sum of its proper divisors (1).

149985281 is an equidigital number, since it uses as much as digits as its factorization.

149985281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 149985281 is about 12246.8477985153. The cubic root of 149985281 is about 531.3119048323.

The spelling of 149985281 in words is "one hundred forty-nine million, nine hundred eighty-five thousand, two hundred eighty-one".