991655546 has 16 divisors (see below), whose sum is σ = 1732057344. Its totient is φ = 416976144.

The previous prime is 991655503. The next prime is 991655573. The reversal of 991655546 is 645556199.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 991655494 and 991655503.

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, 667490 + ... + 668973.

It is an arithmetic number, because the mean of its divisors is an integer number (108253584).

Almost surely, 2^991655546 is an apocalyptic number.

991655546 is a deficient number, since it is larger than the sum of its proper divisors (740401798).

991655546 is a wasteful number, since it uses less digits than its factorization.

991655546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336525.

The product of its digits is 1458000, while the sum is 50.

The square root of 991655546 is about 31490.5628085622. The cubic root of 991655546 is about 997.2107426100.

The spelling of 991655546 in words is "nine hundred ninety-one million, six hundred fifty-five thousand, five hundred forty-six".