2651991771 has 24 divisors (see below), whose sum is σ = 4177002816. Its totient is φ = 1483628640.

The previous prime is 2651991763. The next prime is 2651991791. The reversal of 2651991771 is 1771991562.

It is not a de Polignac number, because 2651991771 - 2³ = 2651991763 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2651991771.

It is not an unprimeable number, because it can be changed into a prime (2651991731) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 232185 + ... + 243338.

It is an arithmetic number, because the mean of its divisors is an integer number (174041784).

Almost surely, 2^2651991771 is an apocalyptic number.

2651991771 is a deficient number, since it is larger than the sum of its proper divisors (1525011045).

2651991771 is a wasteful number, since it uses less digits than its factorization.

2651991771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475563 (or 475550 counting only the distinct ones).

The product of its digits is 238140, while the sum is 48.

The square root of 2651991771 is about 51497.4928613035. The cubic root of 2651991771 is about 1384.1741171327.

The spelling of 2651991771 in words is "two billion, six hundred fifty-one million, nine hundred ninety-one thousand, seven hundred seventy-one".