123012157 has 2 divisors, whose sum is σ = 123012158. Its totient is φ = 123012156.

The previous prime is 123012143. The next prime is 123012203. The reversal of 123012157 is 751210321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110544196 + 12467961 = 10514^2 + 3531^2 .

It is a cyclic number.

It is not a de Polignac number, because 123012157 - 2¹¹ = 123010109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123012107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61506078 + 61506079.

It is an arithmetic number, because the mean of its divisors is an integer number (61506079).

Almost surely, 2^123012157 is an apocalyptic number.

It is an amenable number.

123012157 is a deficient number, since it is larger than the sum of its proper divisors (1).

123012157 is an equidigital number, since it uses as much as digits as its factorization.

123012157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 123012157 is about 11091.0845727548. The cubic root of 123012157 is about 497.3353673586.

Adding to 123012157 its reverse (751210321), we get a palindrome (874222478).

The spelling of 123012157 in words is "one hundred twenty-three million, twelve thousand, one hundred fifty-seven".