283991221 has 8 divisors (see below), whose sum is σ = 290822400. Its totient is φ = 277170432.

The previous prime is 283991219. The next prime is 283991263. The reversal of 283991221 is 122199382.

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

It is not a de Polignac number, because 283991221 - 2¹ = 283991219 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 (283991621) 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, 101781 + ... + 104533.

It is an arithmetic number, because the mean of its divisors is an integer number (36352800).

Almost surely, 2^283991221 is an apocalyptic number.

It is an amenable number.

283991221 is a deficient number, since it is larger than the sum of its proper divisors (6831179).

283991221 is a wasteful number, since it uses less digits than its factorization.

283991221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5195.

The product of its digits is 15552, while the sum is 37.

The square root of 283991221 is about 16852.0390754354. The cubic root of 283991221 is about 657.3070721188.

The spelling of 283991221 in words is "two hundred eighty-three million, nine hundred ninety-one thousand, two hundred twenty-one".