23129191 has 4 divisors (see below), whose sum is σ = 24134832. Its totient is φ = 22123552.

The previous prime is 23129189. The next prime is 23129201. The reversal of 23129191 is 19192132.

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 23129191 - 2¹ = 23129189 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 (23129111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502786 + ... + 502831.

It is an arithmetic number, because the mean of its divisors is an integer number (6033708).

Almost surely, 2^23129191 is an apocalyptic number.

23129191 is a deficient number, since it is larger than the sum of its proper divisors (1005641).

23129191 is a wasteful number, since it uses less digits than its factorization.

23129191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005640.

The product of its digits is 972, while the sum is 28.

The square root of 23129191 is about 4809.2817551065. The cubic root of 23129191 is about 284.9181708237.

The spelling of 23129191 in words is "twenty-three million, one hundred twenty-nine thousand, one hundred ninety-one".