156022201 has 4 divisors (see below), whose sum is σ = 158580004. Its totient is φ = 153464400.

The previous prime is 156022171. The next prime is 156022211. The reversal of 156022201 is 102220651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102220651 = 13 ⋅7863127.

It can be written as a sum of positive squares in 2 ways, for example, as 17842176 + 138180025 = 4224^2 + 11755^2 .

It is a cyclic number.

It is not a de Polignac number, because 156022201 - 2⁹ = 156021689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156022211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1278810 + ... + 1278931.

It is an arithmetic number, because the mean of its divisors is an integer number (39645001).

Almost surely, 2^156022201 is an apocalyptic number.

It is an amenable number.

156022201 is a deficient number, since it is larger than the sum of its proper divisors (2557803).

156022201 is an equidigital number, since it uses as much as digits as its factorization.

156022201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2557802.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 156022201 is about 12490.8847164642. The cubic root of 156022201 is about 538.3467968998.

Adding to 156022201 its reverse (102220651), we get a palindrome (258242852).

The spelling of 156022201 in words is "one hundred fifty-six million, twenty-two thousand, two hundred one".