99780122 has 16 divisors (see below), whose sum is σ = 162783432. Its totient is φ = 45595200.

The previous prime is 99780091. The next prime is 99780137. The reversal of 99780122 is 22108799.

It is a Cunningham number, because it is equal to 9989²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 99780121 + 1 = 9989^2 + 1^2 .

It is an unprimeable number.

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, 16373 + ... + 21624.

Almost surely, 2^99780122 is an apocalyptic number.

99780122 is a deficient number, since it is larger than the sum of its proper divisors (63003310).

99780122 is a wasteful number, since it uses less digits than its factorization.

99780122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38113.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 99780122 is about 9989.0000500551. Note that the first 4 decimals coincide. The cubic root of 99780122 is about 463.8184392955.

The spelling of 99780122 in words is "ninety-nine million, seven hundred eighty thousand, one hundred twenty-two".