99447970981 has 8 divisors (see below), whose sum is σ = 99557602200. Its totient is φ = 99338403840.

The previous prime is 99447970901. The next prime is 99447971009. The reversal of 99447970981 is 18907974499.

It can be written as a sum of positive squares in 4 ways, for example, as 7633516900 + 91814454081 = 87370^2 + 303009^2 .

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 99447970981 - 2²³ = 99439582373 is a prime.

It is a super-2 number, since 2×99447970981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99447970901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3501285 + ... + 3529573.

It is an arithmetic number, because the mean of its divisors is an integer number (12444700275).

Almost surely, 2^99447970981 is an apocalyptic number.

It is an amenable number.

99447970981 is a deficient number, since it is larger than the sum of its proper divisors (109631219).

99447970981 is a wasteful number, since it uses less digits than its factorization.

99447970981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32039.

The product of its (nonzero) digits is 41150592, while the sum is 67.

The spelling of 99447970981 in words is "ninety-nine billion, four hundred forty-seven million, nine hundred seventy thousand, nine hundred eighty-one".