150721 has 2 divisors, whose sum is σ = 150722. Its totient is φ = 150720.

The previous prime is 150707. The next prime is 150743. The reversal of 150721 is 127051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132496 + 18225 = 364^2 + 135^2 .

It is an emirp because it is prime and its reverse (127051) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 150721 - 2⁹ = 150209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 150695 and 150704.

It is not a weakly prime, because it can be changed into another prime (150791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75360 + 75361.

It is an arithmetic number, because the mean of its divisors is an integer number (75361).

2¹⁵⁰⁷²¹ is an apocalyptic number.

It is an amenable number.

150721 is a deficient number, since it is larger than the sum of its proper divisors (1).

150721 is an equidigital number, since it uses as much as digits as its factorization.

150721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 150721 is about 388.2280257787. The cubic root of 150721 is about 53.2179231825.

Adding to 150721 its reverse (127051), we get a palindrome (277772).

The spelling of 150721 in words is "one hundred fifty thousand, seven hundred twenty-one".