156221099 has 2 divisors, whose sum is σ = 156221100. Its totient is φ = 156221098.

The previous prime is 156221071. The next prime is 156221113. The reversal of 156221099 is 990122651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 156221099 - 2⁸ = 156220843 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (156221069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78110549 + 78110550.

It is an arithmetic number, because the mean of its divisors is an integer number (78110550).

Almost surely, 2^156221099 is an apocalyptic number.

156221099 is a deficient number, since it is larger than the sum of its proper divisors (1).

156221099 is an equidigital number, since it uses as much as digits as its factorization.

156221099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 156221099 is about 12498.8439065379. The cubic root of 156221099 is about 538.5754622912.

The spelling of 156221099 in words is "one hundred fifty-six million, two hundred twenty-one thousand, ninety-nine".