99981501 has 16 divisors (see below), whose sum is σ = 136116288. Its totient is φ = 65260800.

The previous prime is 99981491. The next prime is 99981509. The reversal of 99981501 is 10518999.

It is not a de Polignac number, because 99981501 - 2¹⁰ = 99980477 is a prime.

It is a Curzon number.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42970 + ... + 45236.

It is an arithmetic number, because the mean of its divisors is an integer number (8507268).

Almost surely, 2^99981501 is an apocalyptic number.

It is an amenable number.

99981501 is a deficient number, since it is larger than the sum of its proper divisors (36134787).

99981501 is a wasteful number, since it uses less digits than its factorization.

99981501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2572.

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 99981501 is about 9999.0750072194. The cubic root of 99981501 is about 464.1302600122.

The spelling of 99981501 in words is "ninety-nine million, nine hundred eighty-one thousand, five hundred one".