2145532139 has 2 divisors, whose sum is σ = 2145532140. Its totient is φ = 2145532138.

The previous prime is 2145532133. The next prime is 2145532157. The reversal of 2145532139 is 9312355412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145532139 - 2²⁰ = 2144483563 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 2145532099 and 2145532108.

It is not a weakly prime, because it can be changed into another prime (2145532133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072766069 + 1072766070.

It is an arithmetic number, because the mean of its divisors is an integer number (1072766070).

Almost surely, 2^2145532139 is an apocalyptic number.

2145532139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145532139 is an equidigital number, since it uses as much as digits as its factorization.

2145532139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 2145532139 is about 46319.8892377778. The cubic root of 2145532139 is about 1289.7682292981.

The spelling of 2145532139 in words is "two billion, one hundred forty-five million, five hundred thirty-two thousand, one hundred thirty-nine".