123997543 has 2 divisors, whose sum is σ = 123997544. Its totient is φ = 123997542.

The previous prime is 123997529. The next prime is 123997561. The reversal of 123997543 is 345799321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123997543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123997543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123997043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61998771 + 61998772.

It is an arithmetic number, because the mean of its divisors is an integer number (61998772).

Almost surely, 2^123997543 is an apocalyptic number.

123997543 is a deficient number, since it is larger than the sum of its proper divisors (1).

123997543 is an equidigital number, since it uses as much as digits as its factorization.

123997543 is an evil number, because the sum of its binary digits is even.

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

The square root of 123997543 is about 11135.4184025568. The cubic root of 123997543 is about 498.6598016128.

The spelling of 123997543 in words is "one hundred twenty-three million, nine hundred ninety-seven thousand, five hundred forty-three".