23172120547 has 2 divisors, whose sum is σ = 23172120548. Its totient is φ = 23172120546.

The previous prime is 23172120533. The next prime is 23172120551. The reversal of 23172120547 is 74502127132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23172120547 is a prime.

It is not a weakly prime, because it can be changed into another prime (23172100547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11586060273 + 11586060274.

It is an arithmetic number, because the mean of its divisors is an integer number (11586060274).

Almost surely, 2^23172120547 is an apocalyptic number.

23172120547 is a deficient number, since it is larger than the sum of its proper divisors (1).

23172120547 is an equidigital number, since it uses as much as digits as its factorization.

23172120547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 34.

Adding to 23172120547 its reverse (74502127132), we get a palindrome (97674247679).

The spelling of 23172120547 in words is "twenty-three billion, one hundred seventy-two million, one hundred twenty thousand, five hundred forty-seven".