156221006 has 4 divisors (see below), whose sum is σ = 234331512. Its totient is φ = 78110502.

The previous prime is 156221003. The next prime is 156221011. The reversal of 156221006 is 600122651.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156221003) 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 as a sum of consecutive naturals, namely, 39055250 + ... + 39055253.

It is an arithmetic number, because the mean of its divisors is an integer number (58582878).

Almost surely, 2^156221006 is an apocalyptic number.

156221006 is a deficient number, since it is larger than the sum of its proper divisors (78110506).

156221006 is an equidigital number, since it uses as much as digits as its factorization.

156221006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78110505.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 156221006 is about 12498.8401861933. The cubic root of 156221006 is about 538.5753554181.

Adding to 156221006 its reverse (600122651), we get a palindrome (756343657).

The spelling of 156221006 in words is "one hundred fifty-six million, two hundred twenty-one thousand, six".