156968221 has 8 divisors (see below), whose sum is σ = 162860544. Its totient is φ = 151127760.

The previous prime is 156968219. The next prime is 156968233. The reversal of 156968221 is 122869651.

156968221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 156968221 - 2¹ = 156968219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156968821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6745 + ... + 18958.

It is an arithmetic number, because the mean of its divisors is an integer number (20357568).

Almost surely, 2^156968221 is an apocalyptic number.

It is an amenable number.

156968221 is a deficient number, since it is larger than the sum of its proper divisors (5892323).

156968221 is a wasteful number, since it uses less digits than its factorization.

156968221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25931.

The product of its digits is 51840, while the sum is 40.

The square root of 156968221 is about 12528.6959018088. The cubic root of 156968221 is about 539.4326700550.

The spelling of 156968221 in words is "one hundred fifty-six million, nine hundred sixty-eight thousand, two hundred twenty-one".