228191693 has 4 divisors (see below), whose sum is σ = 228428640. Its totient is φ = 227954748.

The previous prime is 228191681. The next prime is 228191707. The reversal of 228191693 is 396191822.

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.

It is a cyclic number.

It is not a de Polignac number, because 228191693 - 2¹⁸ = 227929549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228191693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228191603) 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, 117023 + ... + 118956.

It is an arithmetic number, because the mean of its divisors is an integer number (57107160).

Almost surely, 2^228191693 is an apocalyptic number.

It is an amenable number.

228191693 is a deficient number, since it is larger than the sum of its proper divisors (236947).

228191693 is an equidigital number, since it uses as much as digits as its factorization.

228191693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236946.

The product of its digits is 46656, while the sum is 41.

The square root of 228191693 is about 15106.0151264323. The cubic root of 228191693 is about 611.0826361963.

The spelling of 228191693 in words is "two hundred twenty-eight million, one hundred ninety-one thousand, six hundred ninety-three".