99478081 has 4 divisors (see below), whose sum is σ = 100358532. Its totient is φ = 98597632.

The previous prime is 99478061. The next prime is 99478103. The reversal of 99478081 is 18087499.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14561856 + 84916225 = 3816^2 + 9215^2 .

It is a cyclic number.

It is not a de Polignac number, because 99478081 - 2¹³ = 99469889 is a prime.

It is a super-4 number, since 4×99478081⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99478021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440056 + ... + 440281.

It is an arithmetic number, because the mean of its divisors is an integer number (25089633).

Almost surely, 2^99478081 is an apocalyptic number.

It is an amenable number.

99478081 is a deficient number, since it is larger than the sum of its proper divisors (880451).

99478081 is a wasteful number, since it uses less digits than its factorization.

99478081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880450.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 99478081 is about 9973.8699109222. The cubic root of 99478081 is about 463.3499632881.

The spelling of 99478081 in words is "ninety-nine million, four hundred seventy-eight thousand, eighty-one".