123021397 has 2 divisors, whose sum is σ = 123021398. Its totient is φ = 123021396.

The previous prime is 123021391. The next prime is 123021413. The reversal of 123021397 is 793120321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121022001 + 1999396 = 11001^2 + 1414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123021397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123021391) 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, 61510698 + 61510699.

It is an arithmetic number, because the mean of its divisors is an integer number (61510699).

Almost surely, 2^123021397 is an apocalyptic number.

It is an amenable number.

123021397 is a deficient number, since it is larger than the sum of its proper divisors (1).

123021397 is an equidigital number, since it uses as much as digits as its factorization.

123021397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 123021397 is about 11091.5011157192. The cubic root of 123021397 is about 497.3478194171.

The spelling of 123021397 in words is "one hundred twenty-three million, twenty-one thousand, three hundred ninety-seven".