991645430 has 16 divisors (see below), whose sum is σ = 1846512720. Its totient is φ = 382980192.

The previous prime is 991645429. The next prime is 991645469. The reversal of 991645430 is 34546199.

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 7 ways as a sum of consecutive naturals, for example, 1709444 + ... + 1710023.

It is an arithmetic number, because the mean of its divisors is an integer number (115407045).

Almost surely, 2^991645430 is an apocalyptic number.

991645430 is a deficient number, since it is larger than the sum of its proper divisors (854867290).

991645430 is a wasteful number, since it uses less digits than its factorization.

991645430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3419503.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 991645430 is about 31490.4021886034. The cubic root of 991645430 is about 997.2073517087.

The spelling of 991645430 in words is "nine hundred ninety-one million, six hundred forty-five thousand, four hundred thirty".