23191289 has 4 divisors (see below), whose sum is σ = 25299600. Its totient is φ = 21082980.

The previous prime is 23191283. The next prime is 23191303. The reversal of 23191289 is 98219132.

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 23191289 - 2¹² = 23187193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23191283) 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, 1054139 + ... + 1054160.

It is an arithmetic number, because the mean of its divisors is an integer number (6324900).

Almost surely, 2^23191289 is an apocalyptic number.

It is an amenable number.

23191289 is a deficient number, since it is larger than the sum of its proper divisors (2108311).

23191289 is a wasteful number, since it uses less digits than its factorization.

23191289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108310.

The product of its digits is 7776, while the sum is 35.

The square root of 23191289 is about 4815.7334851505. The cubic root of 23191289 is about 285.1729288051.

The spelling of 23191289 in words is "twenty-three million, one hundred ninety-one thousand, two hundred eighty-nine".