221749093 has 4 divisors (see below), whose sum is σ = 222048288. Its totient is φ = 221449900.

The previous prime is 221749079. The next prime is 221749097. The reversal of 221749093 is 390947122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 390947122 = 2 ⋅195473561.

It is a cyclic number.

It is not a de Polignac number, because 221749093 - 2¹³ = 221740901 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 (221749097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148483 + ... + 149968.

It is an arithmetic number, because the mean of its divisors is an integer number (55512072).

Almost surely, 2^221749093 is an apocalyptic number.

It is an amenable number.

221749093 is a deficient number, since it is larger than the sum of its proper divisors (299195).

221749093 is an equidigital number, since it uses as much as digits as its factorization.

221749093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299194.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 221749093 is about 14891.2421577248. The cubic root of 221749093 is about 605.2766924161.

The spelling of 221749093 in words is "two hundred twenty-one million, seven hundred forty-nine thousand, ninety-three".