2651721231 has 4 divisors (see below), whose sum is σ = 3535628312. Its totient is φ = 1767814152.

The previous prime is 2651721229. The next prime is 2651721287. The reversal of 2651721231 is 1321271562.

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

It is not a de Polignac number, because 2651721231 - 2¹ = 2651721229 is a prime.

It is a super-5 number, since 5×2651721231⁵ (a number of 48 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651722231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441953536 + ... + 441953541.

It is an arithmetic number, because the mean of its divisors is an integer number (883907078).

Almost surely, 2^2651721231 is an apocalyptic number.

2651721231 is a deficient number, since it is larger than the sum of its proper divisors (883907081).

2651721231 is an equidigital number, since it uses as much as digits as its factorization.

2651721231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883907080.

The product of its digits is 5040, while the sum is 30.

The square root of 2651721231 is about 51494.8660644923. The cubic root of 2651721231 is about 1384.1270472028.

Adding to 2651721231 its reverse (1321271562), we get a palindrome (3972992793).

The spelling of 2651721231 in words is "two billion, six hundred fifty-one million, seven hundred twenty-one thousand, two hundred thirty-one".