123813971 has 2 divisors, whose sum is σ = 123813972. Its totient is φ = 123813970.

The previous prime is 123813961. The next prime is 123813979. The reversal of 123813971 is 179318321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123813971 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123813979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61906985 + 61906986.

It is an arithmetic number, because the mean of its divisors is an integer number (61906986).

Almost surely, 2^123813971 is an apocalyptic number.

123813971 is a deficient number, since it is larger than the sum of its proper divisors (1).

123813971 is an equidigital number, since it uses as much as digits as its factorization.

123813971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 123813971 is about 11127.1726417810. The cubic root of 123813971 is about 498.4135999933.

The spelling of 123813971 in words is "one hundred twenty-three million, eight hundred thirteen thousand, nine hundred seventy-one".