99387281 has 16 divisors (see below), whose sum is σ = 116712960. Its totient is φ = 82866240.

The previous prime is 99387269. The next prime is 99387283. The reversal of 99387281 is 18278399.

It is a cyclic number.

It is not a de Polignac number, because 99387281 - 2¹⁰ = 99386257 is a prime.

It is a super-2 number, since 2×99387281² = 19755663249145922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (99387283) 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, 58715 + ... + 60383.

It is an arithmetic number, because the mean of its divisors is an integer number (7294560).

Almost surely, 2^99387281 is an apocalyptic number.

It is an amenable number.

99387281 is a deficient number, since it is larger than the sum of its proper divisors (17325679).

99387281 is a wasteful number, since it uses less digits than its factorization.

99387281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904.

The product of its digits is 217728, while the sum is 47.

The square root of 99387281 is about 9969.3169776068. The cubic root of 99387281 is about 463.2089440023.

The spelling of 99387281 in words is "ninety-nine million, three hundred eighty-seven thousand, two hundred eighty-one".