99412781 has 8 divisors (see below), whose sum is σ = 107179800. Its totient is φ = 91662912.

The previous prime is 99412777. The next prime is 99412799. The reversal of 99412781 is 18721499.

It can be written as a sum of positive squares in 4 ways, for example, as 11881 + 99400900 = 109^2 + 9970^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99412781 - 2² = 99412777 is a prime.

It is a super-2 number, since 2×99412781² = 19765802052307922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99412721) 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 7 ways as a sum of consecutive naturals, for example, 9395 + ... + 16943.

It is an arithmetic number, because the mean of its divisors is an integer number (13397475).

Almost surely, 2^99412781 is an apocalyptic number.

It is an amenable number.

99412781 is a deficient number, since it is larger than the sum of its proper divisors (7767019).

99412781 is a wasteful number, since it uses less digits than its factorization.

99412781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8575.

The product of its digits is 36288, while the sum is 41.

The square root of 99412781 is about 9970.5958197091. The cubic root of 99412781 is about 463.2485561066.

The spelling of 99412781 in words is "ninety-nine million, four hundred twelve thousand, seven hundred eighty-one".