123171963547 has 2 divisors, whose sum is σ = 123171963548. Its totient is φ = 123171963546.

The previous prime is 123171963517. The next prime is 123171963559. The reversal of 123171963547 is 745369171321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123171963547 - 2⁷ = 123171963419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123171963547.

It is not a weakly prime, because it can be changed into another prime (123171963517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61585981773 + 61585981774.

It is an arithmetic number, because the mean of its divisors is an integer number (61585981774).

Almost surely, 2^123171963547 is an apocalyptic number.

123171963547 is a deficient number, since it is larger than the sum of its proper divisors (1).

123171963547 is an equidigital number, since it uses as much as digits as its factorization.

123171963547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 49.

The spelling of 123171963547 in words is "one hundred twenty-three billion, one hundred seventy-one million, nine hundred sixty-three thousand, five hundred forty-seven".