991425794 has 16 divisors (see below), whose sum is σ = 1493857728. Its totient is φ = 493478832.

The previous prime is 991425751. The next prime is 991425823. The reversal of 991425794 is 497524199.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 616139 + ... + 617745.

It is an arithmetic number, because the mean of its divisors is an integer number (93366108).

Almost surely, 2^991425794 is an apocalyptic number.

991425794 is a deficient number, since it is larger than the sum of its proper divisors (502431934).

991425794 is a wasteful number, since it uses less digits than its factorization.

991425794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809.

The product of its digits is 816480, while the sum is 50.

The square root of 991425794 is about 31486.9146471991. The cubic root of 991425794 is about 997.1337236425.

The spelling of 991425794 in words is "nine hundred ninety-one million, four hundred twenty-five thousand, seven hundred ninety-four".