2105553145 has 4 divisors (see below), whose sum is σ = 2526663780. Its totient is φ = 1684442512.

The previous prime is 2105553143. The next prime is 2105553167. The reversal of 2105553145 is 5413555012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1299674601 + 805878544 = 36051^2 + 28388^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105553145 - 2¹ = 2105553143 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2105553143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210555310 + ... + 210555319.

It is an arithmetic number, because the mean of its divisors is an integer number (631665945).

Almost surely, 2^2105553145 is an apocalyptic number.

It is an amenable number.

2105553145 is a deficient number, since it is larger than the sum of its proper divisors (421110635).

2105553145 is an equidigital number, since it uses as much as digits as its factorization.

2105553145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421110634.

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 2105553145 is about 45886.3067265170. The cubic root of 2105553145 is about 1281.7069400294.

The spelling of 2105553145 in words is "two billion, one hundred five million, five hundred fifty-three thousand, one hundred forty-five".