2105906261 has 2 divisors, whose sum is σ = 2105906262. Its totient is φ = 2105906260.

The previous prime is 2105906207. The next prime is 2105906303. The reversal of 2105906261 is 1626095012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2105892100 + 14161 = 45890^2 + 119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105906261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2107906261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052953130 + 1052953131.

It is an arithmetic number, because the mean of its divisors is an integer number (1052953131).

Almost surely, 2^2105906261 is an apocalyptic number.

It is an amenable number.

2105906261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105906261 is an equidigital number, since it uses as much as digits as its factorization.

2105906261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 2105906261 is about 45890.1542926149. The cubic root of 2105906261 is about 1281.7785864327.

The spelling of 2105906261 in words is "two billion, one hundred five million, nine hundred six thousand, two hundred sixty-one".