999152231 has 16 divisors (see below), whose sum is σ = 1251065088. Its totient is φ = 775204800.

The previous prime is 999152201. The next prime is 999152233. The reversal of 999152231 is 132251999.

It is a cyclic number.

It is not a de Polignac number, because 999152231 - 2¹⁰ = 999151207 is a prime.

It is a super-2 number, since 2×999152231² = 1996610361424554722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999152233) 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 15 ways as a sum of consecutive naturals, for example, 9905 + ... + 45786.

It is an arithmetic number, because the mean of its divisors is an integer number (78191568).

Almost surely, 2^999152231 is an apocalyptic number.

999152231 is a deficient number, since it is larger than the sum of its proper divisors (251912857).

999152231 is a wasteful number, since it uses less digits than its factorization.

999152231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55942.

The product of its digits is 43740, while the sum is 41.

The square root of 999152231 is about 31609.3693546708. The cubic root of 999152231 is about 999.7173304388.

The spelling of 999152231 in words is "nine hundred ninety-nine million, one hundred fifty-two thousand, two hundred thirty-one".