123111997 has 4 divisors (see below), whose sum is σ = 123246880. Its totient is φ = 122977116.

The previous prime is 123111979. The next prime is 123112019. The reversal of 123111997 is 799111321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123111997 - 2⁷ = 123111869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123111917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66063 + ... + 67900.

It is an arithmetic number, because the mean of its divisors is an integer number (30811720).

Almost surely, 2^123111997 is an apocalyptic number.

It is an amenable number.

123111997 is a deficient number, since it is larger than the sum of its proper divisors (134883).

123111997 is an equidigital number, since it uses as much as digits as its factorization.

123111997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134882.

The product of its digits is 3402, while the sum is 34.

The square root of 123111997 is about 11095.5845722522. The cubic root of 123111997 is about 497.4698812604.

The spelling of 123111997 in words is "one hundred twenty-three million, one hundred eleven thousand, nine hundred ninety-seven".