2651721229 has 2 divisors, whose sum is σ = 2651721230. Its totient is φ = 2651721228.

The previous prime is 2651721181. The next prime is 2651721287. The reversal of 2651721229 is 9221271562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1812460329 + 839260900 = 42573^2 + 28970^2 .

It is a cyclic number.

It is not a de Polignac number, because 2651721229 - 2¹³ = 2651713037 is a prime.

It is a super-5 number, since 5×2651721229⁵ (a number of 48 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2651721299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325860614 + 1325860615.

It is an arithmetic number, because the mean of its divisors is an integer number (1325860615).

Almost surely, 2^2651721229 is an apocalyptic number.

It is an amenable number.

2651721229 is a deficient number, since it is larger than the sum of its proper divisors (1).

2651721229 is an equidigital number, since it uses as much as digits as its factorization.

2651721229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 2651721229 is about 51494.8660450729. The cubic root of 2651721229 is about 1384.1270468548.

The spelling of 2651721229 in words is "two billion, six hundred fifty-one million, seven hundred twenty-one thousand, two hundred twenty-nine".