122989791 has 8 divisors (see below), whose sum is σ = 167986224. Its totient is φ = 79993280.

The previous prime is 122989787. The next prime is 122989799. The reversal of 122989791 is 197989221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122989791 - 2² = 122989787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122989791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122989799) 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 7 ways as a sum of consecutive naturals, for example, 499836 + ... + 500081.

It is an arithmetic number, because the mean of its divisors is an integer number (20998278).

Almost surely, 2^122989791 is an apocalyptic number.

122989791 is a deficient number, since it is larger than the sum of its proper divisors (44996433).

122989791 is an equidigital number, since it uses as much as digits as its factorization.

122989791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999961.

The product of its digits is 163296, while the sum is 48.

The square root of 122989791 is about 11090.0762395937. The cubic root of 122989791 is about 497.3052237876.

The spelling of 122989791 in words is "one hundred twenty-two million, nine hundred eighty-nine thousand, seven hundred ninety-one".