23151979 has 4 divisors (see below), whose sum is σ = 23318680. Its totient is φ = 22985280.

The previous prime is 23151959. The next prime is 23151983. The reversal of 23151979 is 97915132.

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 23151979 - 2⁷ = 23151851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23151929) 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, 83142 + ... + 83419.

It is an arithmetic number, because the mean of its divisors is an integer number (5829670).

Almost surely, 2^23151979 is an apocalyptic number.

23151979 is a deficient number, since it is larger than the sum of its proper divisors (166701).

23151979 is a wasteful number, since it uses less digits than its factorization.

23151979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166700.

The product of its digits is 17010, while the sum is 37.

The square root of 23151979 is about 4811.6503405796. The cubic root of 23151979 is about 285.0117118404.

The spelling of 23151979 in words is "twenty-three million, one hundred fifty-one thousand, nine hundred seventy-nine".