1920689071 has 4 divisors (see below), whose sum is σ = 2195073232. Its totient is φ = 1646304912.

The previous prime is 1920689059. The next prime is 1920689093. The reversal of 1920689071 is 1709860291.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1920689071 - 2¹⁵ = 1920656303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920689171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137192070 + ... + 137192083.

It is an arithmetic number, because the mean of its divisors is an integer number (548768308).

Almost surely, 2^1920689071 is an apocalyptic number.

1920689071 is a deficient number, since it is larger than the sum of its proper divisors (274384161).

1920689071 is an equidigital number, since it uses as much as digits as its factorization.

1920689071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274384160.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 1920689071 is about 43825.6668061080. Note that the first 3 decimals coincide. The cubic root of 1920689071 is about 1243.0416723621.

The spelling of 1920689071 in words is "one billion, nine hundred twenty million, six hundred eighty-nine thousand, seventy-one".