1919139777 has 8 divisors (see below), whose sum is σ = 2843170080. Its totient is φ = 1279426500.

The previous prime is 1919139763. The next prime is 1919139793. The reversal of 1919139777 is 7779319191.

It is not a de Polignac number, because 1919139777 - 2⁶ = 1919139713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1919139737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35539599 + ... + 35539652.

It is an arithmetic number, because the mean of its divisors is an integer number (355396260).

Almost surely, 2^1919139777 is an apocalyptic number.

It is an amenable number.

1919139777 is a deficient number, since it is larger than the sum of its proper divisors (924030303).

1919139777 is an equidigital number, since it uses as much as digits as its factorization.

1919139777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71079260 (or 71079254 counting only the distinct ones).

The product of its digits is 750141, while the sum is 54.

The square root of 1919139777 is about 43807.9875935885. The cubic root of 1919139777 is about 1242.7073557044.

The spelling of 1919139777 in words is "one billion, nine hundred nineteen million, one hundred thirty-nine thousand, seven hundred seventy-seven".