122979155 has 8 divisors (see below), whose sum is σ = 158926992. Its totient is φ = 90815328.

The previous prime is 122979151. The next prime is 122979161. The reversal of 122979155 is 551979221.

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 122979155 - 2² = 122979151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122979151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945929 + ... + 946058.

It is an arithmetic number, because the mean of its divisors is an integer number (19865874).

Almost surely, 2^122979155 is an apocalyptic number.

122979155 is a deficient number, since it is larger than the sum of its proper divisors (35947837).

122979155 is a wasteful number, since it uses less digits than its factorization.

122979155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892005.

The product of its digits is 56700, while the sum is 41.

The square root of 122979155 is about 11089.5967014134. The cubic root of 122979155 is about 497.2908879342.

The spelling of 122979155 in words is "one hundred twenty-two million, nine hundred seventy-nine thousand, one hundred fifty-five".