2138491207 has 2 divisors, whose sum is σ = 2138491208. Its totient is φ = 2138491206.

The previous prime is 2138491177. The next prime is 2138491219. The reversal of 2138491207 is 7021948312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2138491207 - 2²³ = 2130102599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138491247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069245603 + 1069245604.

It is an arithmetic number, because the mean of its divisors is an integer number (1069245604).

Almost surely, 2^2138491207 is an apocalyptic number.

2138491207 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138491207 is an equidigital number, since it uses as much as digits as its factorization.

2138491207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 2138491207 is about 46243.8234470291. The cubic root of 2138491207 is about 1288.3558178673.

The spelling of 2138491207 in words is "two billion, one hundred thirty-eight million, four hundred ninety-one thousand, two hundred seven".