126123551 has 2 divisors, whose sum is σ = 126123552. Its totient is φ = 126123550.

The previous prime is 126123541. The next prime is 126123589. The reversal of 126123551 is 155321621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126123551 - 2¹⁰ = 126122527 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126123551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126123541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63061775 + 63061776.

It is an arithmetic number, because the mean of its divisors is an integer number (63061776).

Almost surely, 2^126123551 is an apocalyptic number.

126123551 is a deficient number, since it is larger than the sum of its proper divisors (1).

126123551 is an equidigital number, since it uses as much as digits as its factorization.

126123551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 26.

The square root of 126123551 is about 11230.4742108248. The cubic root of 126123551 is about 501.4936018643.

The spelling of 126123551 in words is "one hundred twenty-six million, one hundred twenty-three thousand, five hundred fifty-one".