2102545561 has 2 divisors, whose sum is σ = 2102545562. Its totient is φ = 2102545560.

The previous prime is 2102545541. The next prime is 2102545573. The reversal of 2102545561 is 1655452012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1850720400 + 251825161 = 43020^2 + 15869^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102545561 - 2²⁵ = 2068991129 is a prime.

It is not a weakly prime, because it can be changed into another prime (2102545541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051272780 + 1051272781.

It is an arithmetic number, because the mean of its divisors is an integer number (1051272781).

Almost surely, 2^2102545561 is an apocalyptic number.

It is an amenable number.

2102545561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102545561 is an equidigital number, since it uses as much as digits as its factorization.

2102545561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 2102545561 is about 45853.5228853793. The cubic root of 2102545561 is about 1281.0963834197.

Adding to 2102545561 its reverse (1655452012), we get a palindrome (3757997573).

The spelling of 2102545561 in words is "two billion, one hundred two million, five hundred forty-five thousand, five hundred sixty-one".