991619166 has 32 divisors (see below), whose sum is σ = 2057882400. Its totient is φ = 318283776.

The previous prime is 991619149. The next prime is 991619249. The reversal of 991619166 is 661916199.

991619166 is a strobogrammatic number because it is the same when read upside-down.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 1491 + ... + 44558.

It is an arithmetic number, because the mean of its divisors is an integer number (64308825).

Almost surely, 2^991619166 is an apocalyptic number.

991619166 is an abundant number, since it is smaller than the sum of its proper divisors (1066263234).

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

991619166 is a wasteful number, since it uses less digits than its factorization.

991619166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46188.

The product of its digits is 157464, while the sum is 48.

The square root of 991619166 is about 31489.9851698917. The cubic root of 991619166 is about 997.1985478613.

The spelling of 991619166 in words is "nine hundred ninety-one million, six hundred nineteen thousand, one hundred sixty-six".