23139291 has 8 divisors (see below), whose sum is σ = 35259904. Its totient is φ = 13222440.

The previous prime is 23139287. The next prime is 23139307. The reversal of 23139291 is 19293132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23139291 - 2² = 23139287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23139241) 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 7 ways as a sum of consecutive naturals, for example, 550915 + ... + 550956.

It is an arithmetic number, because the mean of its divisors is an integer number (4407488).

Almost surely, 2^23139291 is an apocalyptic number.

23139291 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23139291 is a deficient number, since it is larger than the sum of its proper divisors (12120613).

23139291 is a wasteful number, since it uses less digits than its factorization.

23139291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101881.

The product of its digits is 2916, while the sum is 30.

The square root of 23139291 is about 4810.3316933451. The cubic root of 23139291 is about 284.9596372510.

The spelling of 23139291 in words is "twenty-three million, one hundred thirty-nine thousand, two hundred ninety-one".