149521 has 2 divisors, whose sum is σ = 149522. Its totient is φ = 149520.

The previous prime is 149519. The next prime is 149531. The reversal of 149521 is 125941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148225 + 1296 = 385^2 + 36^2 .

It is an emirp because it is prime and its reverse (125941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149521 - 2¹ = 149519 is a prime.

Together with 149519, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 149492 and 149501.

It is not a weakly prime, because it can be changed into another prime (149531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74760 + 74761.

It is an arithmetic number, because the mean of its divisors is an integer number (74761).

2¹⁴⁹⁵²¹ is an apocalyptic number.

It is an amenable number.

149521 is a deficient number, since it is larger than the sum of its proper divisors (1).

149521 is an equidigital number, since it uses as much as digits as its factorization.

149521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 22.

The square root of 149521 is about 386.6794538116. The cubic root of 149521 is about 53.0763110997.

The spelling of 149521 in words is "one hundred forty-nine thousand, five hundred twenty-one".