126691 has 2 divisors, whose sum is σ = 126692. Its totient is φ = 126690.

The previous prime is 126683. The next prime is 126703. The reversal of 126691 is 196621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126691 - 2³ = 126683 is a prime.

It is an Ulam number.

It is equal to p₁₁₈₇₈ and since 126691 and 11878 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (126601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63345 + 63346.

It is an arithmetic number, because the mean of its divisors is an integer number (63346).

2¹²⁶⁶⁹¹ is an apocalyptic number.

126691 is the 206-th hex number.

126691 is a deficient number, since it is larger than the sum of its proper divisors (1).

126691 is an equidigital number, since it uses as much as digits as its factorization.

126691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 25.

The square root of 126691 is about 355.9367921415. The cubic root of 126691 is about 50.2244575352.

The spelling of 126691 in words is "one hundred twenty-six thousand, six hundred ninety-one".