991946007 has 60 divisors (see below), whose sum is σ = 1616616144. Its totient is φ = 605854080.

The previous prime is 991946003. The next prime is 991946057. The reversal of 991946007 is 700649199.

It is not a de Polignac number, because 991946007 - 2² = 991946003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991946003) 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 59 ways as a sum of consecutive naturals, for example, 3189382 + ... + 3189692.

Almost surely, 2^991946007 is an apocalyptic number.

991946007 is a deficient number, since it is larger than the sum of its proper divisors (624670137).

991946007 is a wasteful number, since it uses less digits than its factorization.

991946007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582 (or 560 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 991946007 is about 31495.1743446516. The cubic root of 991946007 is about 997.3080958207.

The spelling of 991946007 in words is "nine hundred ninety-one million, nine hundred forty-six thousand, seven".