991696506 has 16 divisors (see below), whose sum is σ = 1985498784. Its totient is φ = 330214544.

The previous prime is 991696483. The next prime is 991696523. The reversal of 991696506 is 605696199.

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, 81585 + ... + 92948.

It is an arithmetic number, because the mean of its divisors is an integer number (124093674).

Almost surely, 2^991696506 is an apocalyptic number.

991696506 is an abundant number, since it is smaller than the sum of its proper divisors (993802278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991696506 is a wasteful number, since it uses less digits than its factorization.

991696506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175485.

The product of its (nonzero) digits is 787320, while the sum is 51.

The square root of 991696506 is about 31491.2131554184. The cubic root of 991696506 is about 997.2244722395.

The spelling of 991696506 in words is "nine hundred ninety-one million, six hundred ninety-six thousand, five hundred six".