2145222139 has 2 divisors, whose sum is σ = 2145222140. Its totient is φ = 2145222138.

The previous prime is 2145222127. The next prime is 2145222173. The reversal of 2145222139 is 9312225412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145222139 - 2²¹ = 2143124987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2145222139.

It is not a weakly prime, because it can be changed into another prime (2145222199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072611069 + 1072611070.

It is an arithmetic number, because the mean of its divisors is an integer number (1072611070).

Almost surely, 2^2145222139 is an apocalyptic number.

2145222139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145222139 is an equidigital number, since it uses as much as digits as its factorization.

2145222139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 2145222139 is about 46316.5428221926. The cubic root of 2145222139 is about 1289.7061083598.

The spelling of 2145222139 in words is "two billion, one hundred forty-five million, two hundred twenty-two thousand, one hundred thirty-nine".