149772281 has 2 divisors, whose sum is σ = 149772282. Its totient is φ = 149772280.

The previous prime is 149772277. The next prime is 149772289. The reversal of 149772281 is 182277941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78943225 + 70829056 = 8885^2 + 8416^2 .

It is an emirp because it is prime and its reverse (182277941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149772281 - 2² = 149772277 is a prime.

It is a super-2 number, since 2×149772281² = 44863472311885922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (149772289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74886140 + 74886141.

It is an arithmetic number, because the mean of its divisors is an integer number (74886141).

Almost surely, 2^149772281 is an apocalyptic number.

It is an amenable number.

149772281 is a deficient number, since it is larger than the sum of its proper divisors (1).

149772281 is an equidigital number, since it uses as much as digits as its factorization.

149772281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 149772281 is about 12238.1485936395. The cubic root of 149772281 is about 531.0602733624.

The spelling of 149772281 in words is "one hundred forty-nine million, seven hundred seventy-two thousand, two hundred eighty-one".