150785721 has 6 divisors (see below), whose sum is σ = 217801610. Its totient is φ = 100523808.

The previous prime is 150785639. The next prime is 150785743. The reversal of 150785721 is 127587051.

150785721 is a `hidden beast` number, since 1 + 507 + 85 + 72 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 112593321 + 38192400 = 10611^2 + 6180^2 .

It is not a de Polignac number, because 150785721 - 2¹⁸ = 150523577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (150785771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8376976 + ... + 8376993.

Almost surely, 2^150785721 is an apocalyptic number.

It is an amenable number.

150785721 is a deficient number, since it is larger than the sum of its proper divisors (67015889).

150785721 is a wasteful number, since it uses less digits than its factorization.

150785721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16753975 (or 16753972 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 36.

The square root of 150785721 is about 12279.4837432198. The cubic root of 150785721 is about 532.2553951627.

The spelling of 150785721 in words is "one hundred fifty million, seven hundred eighty-five thousand, seven hundred twenty-one".