991749230 has 16 divisors (see below), whose sum is σ = 1890157680. Its totient is φ = 373364352.

The previous prime is 991749191. The next prime is 991749263. The reversal of 991749230 is 32947199.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2916740 + ... + 2917079.

It is an arithmetic number, because the mean of its divisors is an integer number (118134855).

Almost surely, 2^991749230 is an apocalyptic number.

991749230 is a deficient number, since it is larger than the sum of its proper divisors (898408450).

991749230 is a wasteful number, since it uses less digits than its factorization.

991749230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5833843.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 991749230 is about 31492.0502666943. The cubic root of 991749230 is about 997.2421445586.

The spelling of 991749230 in words is "nine hundred ninety-one million, seven hundred forty-nine thousand, two hundred thirty".