2611889261 has 2 divisors, whose sum is σ = 2611889262. Its totient is φ = 2611889260.

The previous prime is 2611889257. The next prime is 2611889323. The reversal of 2611889261 is 1629881162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1934328361 + 677560900 = 43981^2 + 26030^2 .

It is a cyclic number.

It is not a de Polignac number, because 2611889261 - 2² = 2611889257 is a prime.

It is a super-2 number, since 2×2611889261² = 13643931023454252242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2611889251) 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 as a sum of consecutive naturals, namely, 1305944630 + 1305944631.

It is an arithmetic number, because the mean of its divisors is an integer number (1305944631).

Almost surely, 2^2611889261 is an apocalyptic number.

It is an amenable number.

2611889261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2611889261 is an equidigital number, since it uses as much as digits as its factorization.

2611889261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 44.

The square root of 2611889261 is about 51106.6459572530. The cubic root of 2611889261 is about 1377.1616486451.

The spelling of 2611889261 in words is "two billion, six hundred eleven million, eight hundred eighty-nine thousand, two hundred sixty-one".