9999231 has 8 divisors (see below), whose sum is σ = 14544384. Its totient is φ = 6060120.

The previous prime is 9999221. The next prime is 9999233. The reversal of 9999231 is 1329999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9999231 - 2⁶ = 9999167 is a prime.

It is a super-2 number, since 2×9999231² = 199969241182722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151471 + ... + 151536.

It is an arithmetic number, because the mean of its divisors is an integer number (1818048).

Almost surely, 2^9999231 is an apocalyptic number.

9999231 is a deficient number, since it is larger than the sum of its proper divisors (4545153).

9999231 is a wasteful number, since it uses less digits than its factorization.

9999231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303021.

The product of its digits is 39366, while the sum is 42.

The square root of 9999231 is about 3162.1560682547. The cubic root of 9999231 is about 215.4379463274.

The spelling of 9999231 in words is "nine million, nine hundred ninety-nine thousand, two hundred thirty-one".