99531439 has 4 divisors (see below), whose sum is σ = 113750224. Its totient is φ = 85312656.

The previous prime is 99531433. The next prime is 99531449. The reversal of 99531439 is 93413599.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99531439 - 2³ = 99531431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99531395 and 99531404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99531431) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7109382 + ... + 7109395.

It is an arithmetic number, because the mean of its divisors is an integer number (28437556).

Almost surely, 2^99531439 is an apocalyptic number.

99531439 is a deficient number, since it is larger than the sum of its proper divisors (14218785).

99531439 is a wasteful number, since it uses less digits than its factorization.

99531439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14218784.

The product of its digits is 131220, while the sum is 43.

The square root of 99531439 is about 9976.5444418396. The cubic root of 99531439 is about 463.4327922826.

The spelling of 99531439 in words is "ninety-nine million, five hundred thirty-one thousand, four hundred thirty-nine".