122628981 has 4 divisors (see below), whose sum is σ = 163505312. Its totient is φ = 81752652.

The previous prime is 122628967. The next prime is 122629027. The reversal of 122628981 is 189826221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 122628981 - 2⁷ = 122628853 is a prime.

It is a super-2 number, since 2×122628981² = 30075733962196722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122628911) 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 3 ways as a sum of consecutive naturals, for example, 20438161 + ... + 20438166.

It is an arithmetic number, because the mean of its divisors is an integer number (40876328).

Almost surely, 2^122628981 is an apocalyptic number.

It is an amenable number.

122628981 is a deficient number, since it is larger than the sum of its proper divisors (40876331).

122628981 is an equidigital number, since it uses as much as digits as its factorization.

122628981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40876330.

The product of its digits is 27648, while the sum is 39.

The square root of 122628981 is about 11073.7970452776. The cubic root of 122628981 is about 496.8184396202.

The spelling of 122628981 in words is "one hundred twenty-two million, six hundred twenty-eight thousand, nine hundred eighty-one".