23151993 has 4 divisors (see below), whose sum is σ = 30869328. Its totient is φ = 15434660.

The previous prime is 23151991. The next prime is 23152033. The reversal of 23151993 is 39915132.

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 23151993 - 2¹ = 23151991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23151991) 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, 3858663 + ... + 3858668.

It is an arithmetic number, because the mean of its divisors is an integer number (7717332).

Almost surely, 2^23151993 is an apocalyptic number.

It is an amenable number.

23151993 is a deficient number, since it is larger than the sum of its proper divisors (7717335).

23151993 is an equidigital number, since it uses as much as digits as its factorization.

23151993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7717334.

The product of its digits is 7290, while the sum is 33.

The square root of 23151993 is about 4811.6517953817. The cubic root of 23151993 is about 285.0117692893.

The spelling of 23151993 in words is "twenty-three million, one hundred fifty-one thousand, nine hundred ninety-three".