123949871 has 2 divisors, whose sum is σ = 123949872. Its totient is φ = 123949870.

The previous prime is 123949849. The next prime is 123949877. The reversal of 123949871 is 178949321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123949871 - 2⁶ = 123949807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123949877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61974935 + 61974936.

It is an arithmetic number, because the mean of its divisors is an integer number (61974936).

Almost surely, 2^123949871 is an apocalyptic number.

123949871 is a deficient number, since it is larger than the sum of its proper divisors (1).

123949871 is an equidigital number, since it uses as much as digits as its factorization.

123949871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 123949871 is about 11133.2776395813. The cubic root of 123949871 is about 498.5958886335.

The spelling of 123949871 in words is "one hundred twenty-three million, nine hundred forty-nine thousand, eight hundred seventy-one".