1979181755 has 4 divisors (see below), whose sum is σ = 2375018112. Its totient is φ = 1583345400.

The previous prime is 1979181713. The next prime is 1979181773. The reversal of 1979181755 is 5571819791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5571819791 = 3673 ⋅1516967.

It is not a de Polignac number, because 1979181755 - 2⁸ = 1979181499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1979181697 and 1979181706.

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 3 ways as a sum of consecutive naturals, for example, 197918171 + ... + 197918180.

It is an arithmetic number, because the mean of its divisors is an integer number (593754528).

Almost surely, 2^1979181755 is an apocalyptic number.

1979181755 is a deficient number, since it is larger than the sum of its proper divisors (395836357).

1979181755 is an equidigital number, since it uses as much as digits as its factorization.

1979181755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395836356.

The product of its digits is 793800, while the sum is 53.

The square root of 1979181755 is about 44487.9956280343. The cubic root of 1979181755 is about 1255.5342360250.

The spelling of 1979181755 in words is "one billion, nine hundred seventy-nine million, one hundred eighty-one thousand, seven hundred fifty-five".