291471221 has 8 divisors (see below), whose sum is σ = 298801440. Its totient is φ = 284208912.

The previous prime is 291471217. The next prime is 291471233. The reversal of 291471221 is 122174192.

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 291471221 - 2² = 291471217 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 (291471241) 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, 8231 + ... + 25508.

It is an arithmetic number, because the mean of its divisors is an integer number (37350180).

Almost surely, 2^291471221 is an apocalyptic number.

It is an amenable number.

291471221 is a deficient number, since it is larger than the sum of its proper divisors (7330219).

291471221 is a wasteful number, since it uses less digits than its factorization.

291471221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33955.

The product of its digits is 2016, while the sum is 29.

The square root of 291471221 is about 17072.5282544795. The cubic root of 291471221 is about 663.0280368850.

The spelling of 291471221 in words is "two hundred ninety-one million, four hundred seventy-one thousand, two hundred twenty-one".