1916860109 has 4 divisors (see below), whose sum is σ = 2029616604. Its totient is φ = 1804103616.

The previous prime is 1916860093. The next prime is 1916860123. The reversal of 1916860109 is 9010686191.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 956170084 + 960690025 = 30922^2 + 30995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916860109 - 2⁴ = 1916860093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916860139) 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, 56378222 + ... + 56378255.

It is an arithmetic number, because the mean of its divisors is an integer number (507404151).

Almost surely, 2^1916860109 is an apocalyptic number.

It is an amenable number.

1916860109 is a deficient number, since it is larger than the sum of its proper divisors (112756495).

1916860109 is a wasteful number, since it uses less digits than its factorization.

1916860109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112756494.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 1916860109 is about 43781.9609999369. The cubic root of 1916860109 is about 1242.2151069225.

The spelling of 1916860109 in words is "one billion, nine hundred sixteen million, eight hundred sixty thousand, one hundred nine".