123011971 has 2 divisors, whose sum is σ = 123011972. Its totient is φ = 123011970.

The previous prime is 123011969. The next prime is 123012037. The reversal of 123011971 is 179110321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123011971 - 2¹ = 123011969 is a prime.

Together with 123011969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123011951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61505985 + 61505986.

It is an arithmetic number, because the mean of its divisors is an integer number (61505986).

Almost surely, 2^123011971 is an apocalyptic number.

123011971 is a deficient number, since it is larger than the sum of its proper divisors (1).

123011971 is an equidigital number, since it uses as much as digits as its factorization.

123011971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 123011971 is about 11091.0761876384. The cubic root of 123011971 is about 497.3351166939.

The spelling of 123011971 in words is "one hundred twenty-three million, eleven thousand, nine hundred seventy-one".