137520281 has 2 divisors, whose sum is σ = 137520282. Its totient is φ = 137520280.

The previous prime is 137520221. The next prime is 137520307. The reversal of 137520281 is 182025731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119159056 + 18361225 = 10916^2 + 4285^2 .

It is an emirp because it is prime and its reverse (182025731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137520281 - 2²² = 133325977 is a prime.

It is a super-2 number, since 2×137520281² = 37823655372637922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137520221) 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, 68760140 + 68760141.

It is an arithmetic number, because the mean of its divisors is an integer number (68760141).

Almost surely, 2^137520281 is an apocalyptic number.

It is an amenable number.

137520281 is a deficient number, since it is larger than the sum of its proper divisors (1).

137520281 is an equidigital number, since it uses as much as digits as its factorization.

137520281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 137520281 is about 11726.9041524181. The cubic root of 137520281 is about 516.1654330540.

The spelling of 137520281 in words is "one hundred thirty-seven million, five hundred twenty thousand, two hundred eighty-one".