123549397 has 2 divisors, whose sum is σ = 123549398. Its totient is φ = 123549396.

The previous prime is 123549347. The next prime is 123549469. The reversal of 123549397 is 793945321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117527281 + 6022116 = 10841^2 + 2454^2 .

It is a cyclic number.

It is not a de Polignac number, because 123549397 - 2⁷ = 123549269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123549337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61774698 + 61774699.

It is an arithmetic number, because the mean of its divisors is an integer number (61774699).

Almost surely, 2^123549397 is an apocalyptic number.

It is an amenable number.

123549397 is a deficient number, since it is larger than the sum of its proper divisors (1).

123549397 is an equidigital number, since it uses as much as digits as its factorization.

123549397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 43.

The square root of 123549397 is about 11115.2776393575. The cubic root of 123549397 is about 498.0583322799.

The spelling of 123549397 in words is "one hundred twenty-three million, five hundred forty-nine thousand, three hundred ninety-seven".