126808691 has 4 divisors (see below), whose sum is σ = 128887584. Its totient is φ = 124729800.

The previous prime is 126808687. The next prime is 126808709. The reversal of 126808691 is 196808621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196808621 = 1031 ⋅190891.

It is a cyclic number.

It is not a de Polignac number, because 126808691 - 2² = 126808687 is a prime.

It is a super-2 number, since 2×126808691² = 32160888226266962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126808651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1039355 + ... + 1039476.

It is an arithmetic number, because the mean of its divisors is an integer number (32221896).

Almost surely, 2^126808691 is an apocalyptic number.

126808691 is a deficient number, since it is larger than the sum of its proper divisors (2078893).

126808691 is an equidigital number, since it uses as much as digits as its factorization.

126808691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078892.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 126808691 is about 11260.9365063480. The cubic root of 126808691 is about 502.4000490955.

The spelling of 126808691 in words is "one hundred twenty-six million, eight hundred eight thousand, six hundred ninety-one".