122722991 has 4 divisors (see below), whose sum is σ = 123849000. Its totient is φ = 121596984.

The previous prime is 122722987. The next prime is 122722997. The reversal of 122722991 is 199227221.

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 122722991 - 2² = 122722987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122722997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562841 + ... + 563058.

It is an arithmetic number, because the mean of its divisors is an integer number (30962250).

Almost surely, 2^122722991 is an apocalyptic number.

122722991 is a deficient number, since it is larger than the sum of its proper divisors (1126009).

122722991 is a wasteful number, since it uses less digits than its factorization.

122722991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126008.

The product of its digits is 9072, while the sum is 35.

The square root of 122722991 is about 11078.0409369166. The cubic root of 122722991 is about 496.9453644057.

The spelling of 122722991 in words is "one hundred twenty-two million, seven hundred twenty-two thousand, nine hundred ninety-one".