2261605237 has 2 divisors, whose sum is σ = 2261605238. Its totient is φ = 2261605236.

The previous prime is 2261605211. The next prime is 2261605259. The reversal of 2261605237 is 7325061622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1805740036 + 455865201 = 42494^2 + 21351^2 .

It is a cyclic number.

It is not a de Polignac number, because 2261605237 - 2⁷ = 2261605109 is a prime.

It is a super-2 number, since 2×2261605237² = 10229716496051652338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2261605037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1130802618 + 1130802619.

It is an arithmetic number, because the mean of its divisors is an integer number (1130802619).

Almost surely, 2^2261605237 is an apocalyptic number.

It is an amenable number.

2261605237 is a deficient number, since it is larger than the sum of its proper divisors (1).

2261605237 is an equidigital number, since it uses as much as digits as its factorization.

2261605237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 2261605237 is about 47556.3375061621. The cubic root of 2261605237 is about 1312.6197477077.

Adding to 2261605237 its reverse (7325061622), we get a palindrome (9586666859).

The spelling of 2261605237 in words is "two billion, two hundred sixty-one million, six hundred five thousand, two hundred thirty-seven".