122991012 has 72 divisors (see below), whose sum is σ = 323162112. Its totient is φ = 39398400.

The previous prime is 122990999. The next prime is 122991013. The reversal of 122991012 is 210199221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122991013) 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 23 ways as a sum of consecutive naturals, for example, 212868 + ... + 213444.

Almost surely, 2^122991012 is an apocalyptic number.

122991012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122991012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161581056).

122991012 is an abundant number, since it is smaller than the sum of its proper divisors (200171100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

122991012 is a wasteful number, since it uses less digits than its factorization.

122991012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 122991012 is about 11090.1312886728. The cubic root of 122991012 is about 497.3068694735.

The spelling of 122991012 in words is "one hundred twenty-two million, nine hundred ninety-one thousand, twelve".