2207591861 has 2 divisors, whose sum is σ = 2207591862. Its totient is φ = 2207591860.

The previous prime is 2207591839. The next prime is 2207591887. The reversal of 2207591861 is 1681957022.

2207591861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2140450225 + 67141636 = 46265^2 + 8194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2207591861 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2207591261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1103795930 + 1103795931.

It is an arithmetic number, because the mean of its divisors is an integer number (1103795931).

Almost surely, 2^2207591861 is an apocalyptic number.

It is an amenable number.

2207591861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2207591861 is an equidigital number, since it uses as much as digits as its factorization.

2207591861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 2207591861 is about 46985.0174098084. The cubic root of 2207591861 is about 1302.0857761585.

The spelling of 2207591861 in words is "two billion, two hundred seven million, five hundred ninety-one thousand, eight hundred sixty-one".