23551993 has 2 divisors, whose sum is σ = 23551994. Its totient is φ = 23551992.

The previous prime is 23551991. The next prime is 23552051. The reversal of 23551993 is 39915532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23454649 + 97344 = 4843^2 + 312^2 .

It is a cyclic number.

It is not a de Polignac number, because 23551993 - 2¹ = 23551991 is a prime.

Together with 23551991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23551991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11775996 + 11775997.

It is an arithmetic number, because the mean of its divisors is an integer number (11775997).

Almost surely, 2^23551993 is an apocalyptic number.

It is an amenable number.

23551993 is a deficient number, since it is larger than the sum of its proper divisors (1).

23551993 is an equidigital number, since it uses as much as digits as its factorization.

23551993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36450, while the sum is 37.

The square root of 23551993 is about 4853.0395629955. The cubic root of 23551993 is about 286.6438012830.

The spelling of 23551993 in words is "twenty-three million, five hundred fifty-one thousand, nine hundred ninety-three".