99981500 has 48 divisors (see below), whose sum is σ = 219360960. Its totient is φ = 39809600.

The previous prime is 99981491. The next prime is 99981509. The reversal of 99981500 is 518999.

It is an interprime number because it is at equal distance from previous prime (99981491) and next prime (99981509).

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99981509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179222 + ... + 179778.

It is an arithmetic number, because the mean of its divisors is an integer number (4570020).

Almost surely, 2^99981500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99981500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109680480).

99981500 is an abundant number, since it is smaller than the sum of its proper divisors (119379460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99981500 is a wasteful number, since it uses less digits than its factorization.

99981500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935 (or 923 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 99981500 is about 9999.0749572148. The cubic root of 99981500 is about 464.1302584649.

The spelling of 99981500 in words is "ninety-nine million, nine hundred eighty-one thousand, five hundred".