9991254122 has 16 divisors (see below), whose sum is σ = 15150129192. Its totient is φ = 4941504960.

The previous prime is 9991254113. The next prime is 9991254157. The reversal of 9991254122 is 2214521999.

9991254122 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9864263761 + 126990361 = 99319^2 + 11269^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5129 + ... + 141452.

Almost surely, 2^9991254122 is an apocalyptic number.

9991254122 is a deficient number, since it is larger than the sum of its proper divisors (5158875070).

9991254122 is a wasteful number, since it uses less digits than its factorization.

9991254122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146953.

The product of its digits is 116640, while the sum is 44.

The square root of 9991254122 is about 99956.2610445189. The cubic root of 9991254122 is about 2153.8064260737.

The spelling of 9991254122 in words is "nine billion, nine hundred ninety-one million, two hundred fifty-four thousand, one hundred twenty-two".