2005677631 has 4 divisors (see below), whose sum is σ = 2005779312. Its totient is φ = 2005575952.

The previous prime is 2005677623. The next prime is 2005677643. The reversal of 2005677631 is 1367765002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2005677631 - 2³ = 2005677623 is a prime.

It is a super-2 number, since 2×2005677631² = 8045485518987544322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005677691) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10675 + ... + 64228.

It is an arithmetic number, because the mean of its divisors is an integer number (501444828).

Almost surely, 2^2005677631 is an apocalyptic number.

2005677631 is a deficient number, since it is larger than the sum of its proper divisors (101681).

2005677631 is an equidigital number, since it uses as much as digits as its factorization.

2005677631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101680.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 2005677631 is about 44784.7924076913. The cubic root of 2005677631 is about 1261.1121513009.

The spelling of 2005677631 in words is "two billion, five million, six hundred seventy-seven thousand, six hundred thirty-one".