2051758139 has 4 divisors (see below), whose sum is σ = 2053139424. Its totient is φ = 2050376856.

The previous prime is 2051758021. The next prime is 2051758153. The reversal of 2051758139 is 9318571502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9318571502 = 2 ⋅4659285751.

It is a cyclic number.

It is not a de Polignac number, because 2051758139 - 2¹² = 2051754043 is a prime.

It is a super-2 number, since 2×2051758139² = 8419422921905486642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2051758096 and 2051758105.

It is not an unprimeable number, because it can be changed into a prime (2051758939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688412 + ... + 691385.

It is an arithmetic number, because the mean of its divisors is an integer number (513284856).

Almost surely, 2^2051758139 is an apocalyptic number.

2051758139 is a deficient number, since it is larger than the sum of its proper divisors (1381285).

2051758139 is a wasteful number, since it uses less digits than its factorization.

2051758139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381284.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 2051758139 is about 45296.3369269525. The cubic root of 2051758139 is about 1270.6971473632.

The spelling of 2051758139 in words is "two billion, fifty-one million, seven hundred fifty-eight thousand, one hundred thirty-nine".