23401387543 has 4 divisors (see below), whose sum is σ = 23410992520. Its totient is φ = 23391782568.

The previous prime is 23401387501. The next prime is 23401387567. The reversal of 23401387543 is 34578310432.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23401387543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23401387496 and 23401387505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23401381543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4798833 + ... + 4803706.

It is an arithmetic number, because the mean of its divisors is an integer number (5852748130).

Almost surely, 2^23401387543 is an apocalyptic number.

23401387543 is a deficient number, since it is larger than the sum of its proper divisors (9604977).

23401387543 is an equidigital number, since it uses as much as digits as its factorization.

23401387543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9604976.

The product of its (nonzero) digits is 241920, while the sum is 40.

Adding to 23401387543 its reverse (34578310432), we get a palindrome (57979697975).

The spelling of 23401387543 in words is "twenty-three billion, four hundred one million, three hundred eighty-seven thousand, five hundred forty-three".