2781139445 has 16 divisors (see below), whose sum is σ = 3815434368. Its totient is φ = 1906416960.

The previous prime is 2781139409. The next prime is 2781139451. The reversal of 2781139445 is 5449311872.

It is a de Polignac number, because none of the positive numbers 2^k-2781139445 is a prime.

It is a super-2 number, since 2×2781139445² = 15469473225069816050, 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 = 2781139396 and 2781139405.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 105275 + ... + 129015.

It is an arithmetic number, because the mean of its divisors is an integer number (238464648).

Almost surely, 2^2781139445 is an apocalyptic number.

It is an amenable number.

2781139445 is a deficient number, since it is larger than the sum of its proper divisors (1034294923).

2781139445 is a wasteful number, since it uses less digits than its factorization.

2781139445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27100.

The product of its digits is 241920, while the sum is 44.

The square root of 2781139445 is about 52736.5096019826. The cubic root of 2781139445 is about 1406.2879482237.

The spelling of 2781139445 in words is "two billion, seven hundred eighty-one million, one hundred thirty-nine thousand, four hundred forty-five".