2139475837 has 2 divisors, whose sum is σ = 2139475838. Its totient is φ = 2139475836.

The previous prime is 2139475777. The next prime is 2139475859. The reversal of 2139475837 is 7385749312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1217381881 + 922093956 = 34891^2 + 30366^2 .

It is a cyclic number.

It is not a de Polignac number, because 2139475837 - 2²⁷ = 2005258109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2139475237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069737918 + 1069737919.

It is an arithmetic number, because the mean of its divisors is an integer number (1069737919).

Almost surely, 2^2139475837 is an apocalyptic number.

It is an amenable number.

2139475837 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139475837 is an equidigital number, since it uses as much as digits as its factorization.

2139475837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 49.

The square root of 2139475837 is about 46254.4682922634. The cubic root of 2139475837 is about 1288.5535209862.

The spelling of 2139475837 in words is "two billion, one hundred thirty-nine million, four hundred seventy-five thousand, eight hundred thirty-seven".