126877691 has 4 divisors (see below), whose sum is σ = 127408800. Its totient is φ = 126346584.

The previous prime is 126877661. The next prime is 126877693. The reversal of 126877691 is 196778621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126877691 - 2¹⁰ = 126876667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126877693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265196 + ... + 265673.

It is an arithmetic number, because the mean of its divisors is an integer number (31852200).

Almost surely, 2^126877691 is an apocalyptic number.

126877691 is a deficient number, since it is larger than the sum of its proper divisors (531109).

126877691 is an equidigital number, since it uses as much as digits as its factorization.

126877691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531108.

The product of its digits is 254016, while the sum is 47.

The square root of 126877691 is about 11263.9997780540. Note that the first 3 decimals coincide. The cubic root of 126877691 is about 502.4911556738.

The spelling of 126877691 in words is "one hundred twenty-six million, eight hundred seventy-seven thousand, six hundred ninety-one".