2205451861 has 2 divisors, whose sum is σ = 2205451862. Its totient is φ = 2205451860.

The previous prime is 2205451841. The next prime is 2205451903. The reversal of 2205451861 is 1681545022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2141930961 + 63520900 = 46281^2 + 7970^2 .

It is a cyclic number.

It is not a de Polignac number, because 2205451861 - 2²⁷ = 2071234133 is a prime.

It is a super-2 number, since 2×2205451861² = 9728035822376726642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2205451841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102725930 + 1102725931.

It is an arithmetic number, because the mean of its divisors is an integer number (1102725931).

Almost surely, 2^2205451861 is an apocalyptic number.

It is an amenable number.

2205451861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2205451861 is an equidigital number, since it uses as much as digits as its factorization.

2205451861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 2205451861 is about 46962.2386710855. The cubic root of 2205451861 is about 1301.6649005914.

Adding to 2205451861 its reverse (1681545022), we get a palindrome (3886996883).

The spelling of 2205451861 in words is "two billion, two hundred five million, four hundred fifty-one thousand, eight hundred sixty-one".