122691 has 4 divisors (see below), whose sum is σ = 163592. Its totient is φ = 81792.
The previous prime is 122663. The next prime is 122693. The reversal of 122691 is 196221.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196221 = 3 ⋅65407.
It is not a de Polignac number, because 122691 - 214 = 106307 is a prime.
It is a D-number.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (122693) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20446 + ... + 20451.
It is an arithmetic number, because the mean of its divisors is an integer number (40898).
2122691 is an apocalyptic number.
122691 is a deficient number, since it is larger than the sum of its proper divisors (40901).
122691 is an equidigital number, since it uses as much as digits as its factorization.
122691 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 40900.
The product of its digits is 216, while the sum is 21.
The square root of 122691 is about 350.2727508671. The cubic root of 122691 is about 49.6902179993.
The spelling of 122691 in words is "one hundred twenty-two thousand, six hundred ninety-one".
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