150731221 has 4 divisors (see below), whose sum is σ = 152140032. Its totient is φ = 149322412.

The previous prime is 150731219. The next prime is 150731291. The reversal of 150731221 is 122137051.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 150731221 - 2¹ = 150731219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 150731192 and 150731201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (150731291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704245 + ... + 704458.

It is an arithmetic number, because the mean of its divisors is an integer number (38035008).

Almost surely, 2^150731221 is an apocalyptic number.

It is an amenable number.

150731221 is a deficient number, since it is larger than the sum of its proper divisors (1408811).

150731221 is a wasteful number, since it uses less digits than its factorization.

150731221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408810.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 150731221 is about 12277.2643939927. The cubic root of 150731221 is about 532.1912612946.

Adding to 150731221 its reverse (122137051), we get a palindrome (272868272).

The spelling of 150731221 in words is "one hundred fifty million, seven hundred thirty-one thousand, two hundred twenty-one".