150660721 has 2 divisors, whose sum is σ = 150660722. Its totient is φ = 150660720.

The previous prime is 150660701. The next prime is 150660733. The reversal of 150660721 is 127066051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150405696 + 255025 = 12264^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 150660721 - 2⁷ = 150660593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 150660721.

It is not a weakly prime, because it can be changed into another prime (150660701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75330360 + 75330361.

It is an arithmetic number, because the mean of its divisors is an integer number (75330361).

Almost surely, 2^150660721 is an apocalyptic number.

It is an amenable number.

150660721 is a deficient number, since it is larger than the sum of its proper divisors (1).

150660721 is an equidigital number, since it uses as much as digits as its factorization.

150660721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 150660721 is about 12274.3928974104. The cubic root of 150660721 is about 532.1082761976.

The spelling of 150660721 in words is "one hundred fifty million, six hundred sixty thousand, seven hundred twenty-one".