2139168091 has 2 divisors, whose sum is σ = 2139168092. Its totient is φ = 2139168090.

The previous prime is 2139168049. The next prime is 2139168131. The reversal of 2139168091 is 1908619312.

It is an a-pointer prime, because the next prime (2139168131) can be obtained adding 2139168091 to its sum of digits (40).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2139168091 - 2¹⁹ = 2138643803 is a prime.

It is not a weakly prime, because it can be changed into another prime (2139168001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069584045 + 1069584046.

It is an arithmetic number, because the mean of its divisors is an integer number (1069584046).

Almost surely, 2^2139168091 is an apocalyptic number.

2139168091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139168091 is an equidigital number, since it uses as much as digits as its factorization.

2139168091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 2139168091 is about 46251.1415102373. The cubic root of 2139168091 is about 1288.4917354155.

The spelling of 2139168091 in words is "two billion, one hundred thirty-nine million, one hundred sixty-eight thousand, ninety-one".