123112657 has 12 divisors (see below), whose sum is σ = 131681700. Its totient is φ = 114702336.

The previous prime is 123112643. The next prime is 123112673. The reversal of 123112657 is 756211321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 85951441 + 37161216 = 9271^2 + 6096^2 .

It is a de Polignac number, because none of the positive numbers 2^k-123112657 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 (123112607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273969 + ... + 274417.

It is an arithmetic number, because the mean of its divisors is an integer number (10973475).

Almost surely, 2^123112657 is an apocalyptic number.

123112657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

123112657 is a deficient number, since it is larger than the sum of its proper divisors (8569043).

123112657 is an equidigital number, since it uses as much as digits as its factorization.

123112657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 593 counting only the distinct ones).

The product of its digits is 2520, while the sum is 28.

The square root of 123112657 is about 11095.6143137728. The cubic root of 123112657 is about 497.4707702329.

Adding to 123112657 its reverse (756211321), we get a palindrome (879323978).

The spelling of 123112657 in words is "one hundred twenty-three million, one hundred twelve thousand, six hundred fifty-seven".