223478512991 has 4 divisors (see below), whose sum is σ = 223574059800. Its totient is φ = 223382966184.

The previous prime is 223478512969. The next prime is 223478512993. The reversal of 223478512991 is 199215874322.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 223478512991 - 2⁶ = 223478512927 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 (223478512993) 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, 47769896 + ... + 47774573.

It is an arithmetic number, because the mean of its divisors is an integer number (55893514950).

Almost surely, 2^223478512991 is an apocalyptic number.

223478512991 is a deficient number, since it is larger than the sum of its proper divisors (95546809).

223478512991 is an equidigital number, since it uses as much as digits as its factorization.

223478512991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95546808.

The product of its digits is 2177280, while the sum is 53.

The spelling of 223478512991 in words is "two hundred twenty-three billion, four hundred seventy-eight million, five hundred twelve thousand, nine hundred ninety-one".