126878551 has 2 divisors, whose sum is σ = 126878552. Its totient is φ = 126878550.

The previous prime is 126878539. The next prime is 126878573. The reversal of 126878551 is 155878621.

It is a weak prime.

It is an emirp because it is prime and its reverse (155878621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126878551 - 2⁹ = 126878039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 126878498 and 126878507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126878581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63439275 + 63439276.

It is an arithmetic number, because the mean of its divisors is an integer number (63439276).

Almost surely, 2^126878551 is an apocalyptic number.

126878551 is a deficient number, since it is larger than the sum of its proper divisors (1).

126878551 is an equidigital number, since it uses as much as digits as its factorization.

126878551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 43.

The square root of 126878551 is about 11264.0379527059. The cubic root of 126878551 is about 502.4922909966.

The spelling of 126878551 in words is "one hundred twenty-six million, eight hundred seventy-eight thousand, five hundred fifty-one".