220401291 has 32 divisors (see below), whose sum is σ = 327836160. Its totient is φ = 130592000.

The previous prime is 220401241. The next prime is 220401317. The reversal of 220401291 is 192104022.

It is not a de Polignac number, because 220401291 - 2⁷ = 220401163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220401221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 296266 + ... + 297008.

It is an arithmetic number, because the mean of its divisors is an integer number (10244880).

Almost surely, 2^220401291 is an apocalyptic number.

220401291 is a deficient number, since it is larger than the sum of its proper divisors (107434869).

220401291 is a wasteful number, since it uses less digits than its factorization.

220401291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 220401291 is about 14845.9183279446. The cubic root of 220401291 is about 604.0478988884.

The spelling of 220401291 in words is "two hundred twenty million, four hundred one thousand, two hundred ninety-one".