1919877085 has 24 divisors (see below), whose sum is σ = 2681959896. Its totient is φ = 1315520640.

The previous prime is 1919877083. The next prime is 1919877101. The reversal of 1919877085 is 5807789191.

It can be written as a sum of positive squares in 4 ways, for example, as 668274201 + 1251602884 = 25851^2 + 35378^2 .

It is not a de Polignac number, because 1919877085 - 2¹ = 1919877083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1919877083) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 540415 + ... + 543955.

It is an arithmetic number, because the mean of its divisors is an integer number (111748329).

Almost surely, 2^1919877085 is an apocalyptic number.

It is an amenable number.

1919877085 is a deficient number, since it is larger than the sum of its proper divisors (762082811).

1919877085 is a wasteful number, since it uses less digits than its factorization.

1919877085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773 (or 5766 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 55.

The square root of 1919877085 is about 43816.4020088368. The cubic root of 1919877085 is about 1242.8664792125.

The spelling of 1919877085 in words is "one billion, nine hundred nineteen million, eight hundred seventy-seven thousand, eighty-five".