2139051945 has 16 divisors (see below), whose sum is σ = 3623806080. Its totient is φ = 1073720064.

The previous prime is 2139051917. The next prime is 2139051961. The reversal of 2139051945 is 5491509312.

It is not a de Polignac number, because 2139051945 - 2²⁷ = 2004834217 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4193965 + ... + 4194474.

It is an arithmetic number, because the mean of its divisors is an integer number (226487880).

Almost surely, 2^2139051945 is an apocalyptic number.

It is an amenable number.

2139051945 is a deficient number, since it is larger than the sum of its proper divisors (1484754135).

2139051945 is a wasteful number, since it uses less digits than its factorization.

2139051945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8388464.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 2139051945 is about 46249.8858917511. The cubic root of 2139051945 is about 1288.4684154669.

The spelling of 2139051945 in words is "two billion, one hundred thirty-nine million, fifty-one thousand, nine hundred forty-five".