156493221 has 8 divisors (see below), whose sum is σ = 213097344. Its totient is φ = 102108960.

The previous prime is 156493217. The next prime is 156493223. The reversal of 156493221 is 122394651.

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

It is not a de Polignac number, because 156493221 - 2² = 156493217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156493223) 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, 554800 + ... + 555081.

It is an arithmetic number, because the mean of its divisors is an integer number (26637168).

Almost surely, 2^156493221 is an apocalyptic number.

It is an amenable number.

156493221 is a deficient number, since it is larger than the sum of its proper divisors (56604123).

156493221 is a wasteful number, since it uses less digits than its factorization.

156493221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109931.

The product of its digits is 12960, while the sum is 33.

The square root of 156493221 is about 12509.7250569307. The cubic root of 156493221 is about 538.8879962968.

The spelling of 156493221 in words is "one hundred fifty-six million, four hundred ninety-three thousand, two hundred twenty-one".