3991906055 has 4 divisors (see below), whose sum is σ = 4790287272. Its totient is φ = 3193524840.

The previous prime is 3991905977. The next prime is 3991906067. The reversal of 3991906055 is 5506091993.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3991906055 - 2²² = 3987711751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399190601 + ... + 399190610.

It is an arithmetic number, because the mean of its divisors is an integer number (1197571818).

Almost surely, 2^3991906055 is an apocalyptic number.

3991906055 is a deficient number, since it is larger than the sum of its proper divisors (798381217).

3991906055 is an equidigital number, since it uses as much as digits as its factorization.

3991906055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798381216.

The product of its (nonzero) digits is 328050, while the sum is 47.

The square root of 3991906055 is about 63181.5325470980. The cubic root of 3991906055 is about 1586.3296342426.

The spelling of 3991906055 in words is "three billion, nine hundred ninety-one million, nine hundred six thousand, fifty-five".