99121077225 has 81 divisors (see below), whose sum is σ = 180015398199. Its totient is φ = 52136676000.

The previous prime is 99121077113. The next prime is 99121077227. The reversal of 99121077225 is 52277012199.

The square root of 99121077225 is 314835.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 35683587801 + 63437489424 = 188901^2 + 251868^2 .

It is not a de Polignac number, because 99121077225 - 2²⁹ = 98584206313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (99121077227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 656430900 + ... + 656431050.

Almost surely, 2^99121077225 is an apocalyptic number.

99121077225 is the 314835-th square number.

99121077225 is the 157418-th centered octagonal number.

It is an amenable number.

99121077225 is a deficient number, since it is larger than the sum of its proper divisors (80894320974).

99121077225 is a wasteful number, since it uses less digits than its factorization.

99121077225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The spelling of 99121077225 in words is "ninety-nine billion, one hundred twenty-one million, seventy-seven thousand, two hundred twenty-five".