2145535891 has 2 divisors, whose sum is σ = 2145535892. Its totient is φ = 2145535890.

The previous prime is 2145535871. The next prime is 2145535901. The reversal of 2145535891 is 1985355412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2145535891 - 2¹¹ = 2145533843 is a prime.

It is not a weakly prime, because it can be changed into another prime (2145535801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072767945 + 1072767946.

It is an arithmetic number, because the mean of its divisors is an integer number (1072767946).

Almost surely, 2^2145535891 is an apocalyptic number.

2145535891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145535891 is an equidigital number, since it uses as much as digits as its factorization.

2145535891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 43.

The square root of 2145535891 is about 46319.9297387205. The cubic root of 2145535891 is about 1289.7689811252.

The spelling of 2145535891 in words is "two billion, one hundred forty-five million, five hundred thirty-five thousand, eight hundred ninety-one".