126687551 has 2 divisors, whose sum is σ = 126687552. Its totient is φ = 126687550.

The previous prime is 126687523. The next prime is 126687559. The reversal of 126687551 is 155786621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126687551 - 2⁶ = 126687487 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 126687499 and 126687508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126687559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63343775 + 63343776.

It is an arithmetic number, because the mean of its divisors is an integer number (63343776).

Almost surely, 2^126687551 is an apocalyptic number.

126687551 is a deficient number, since it is larger than the sum of its proper divisors (1).

126687551 is an equidigital number, since it uses as much as digits as its factorization.

126687551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The square root of 126687551 is about 11255.5564500384. The cubic root of 126687551 is about 502.2400176556.

The spelling of 126687551 in words is "one hundred twenty-six million, six hundred eighty-seven thousand, five hundred fifty-one".