123171533893 has 2 divisors, whose sum is σ = 123171533894. Its totient is φ = 123171533892.

The previous prime is 123171533887. The next prime is 123171533981. The reversal of 123171533893 is 398335171321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123171517764 + 16129 = 350958^2 + 127^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123171533893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123171533813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61585766946 + 61585766947.

It is an arithmetic number, because the mean of its divisors is an integer number (61585766947).

Almost surely, 2^123171533893 is an apocalyptic number.

It is an amenable number.

123171533893 is a deficient number, since it is larger than the sum of its proper divisors (1).

123171533893 is an equidigital number, since it uses as much as digits as its factorization.

123171533893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 46.

The spelling of 123171533893 in words is "one hundred twenty-three billion, one hundred seventy-one million, five hundred thirty-three thousand, eight hundred ninety-three".