99391455 has 20 divisors (see below), whose sum is σ = 178169112. Its totient is φ = 53008560.

The previous prime is 99391433. The next prime is 99391463. The reversal of 99391455 is 55419399.

It is a happy number.

It is not a de Polignac number, because 99391455 - 2⁵ = 99391423 is a prime.

It is a super-3 number, since 3×99391455³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 99391455.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 122301 + ... + 123110.

Almost surely, 2^99391455 is an apocalyptic number.

99391455 is a deficient number, since it is larger than the sum of its proper divisors (78777657).

99391455 is a wasteful number, since it uses less digits than its factorization.

99391455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245428 (or 245419 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 99391455 is about 9969.5263177345. The cubic root of 99391455 is about 463.2154284238.

The spelling of 99391455 in words is "ninety-nine million, three hundred ninety-one thousand, four hundred fifty-five".