1916225018 has 4 divisors (see below), whose sum is σ = 2874337530. Its totient is φ = 958112508.

The previous prime is 1916224987. The next prime is 1916225033. The reversal of 1916225018 is 8105226191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8105226191 = 36923 ⋅219517.

It can be written as a sum of positive squares in only one way, i.e., 1841868889 + 74356129 = 42917^2 + 8623^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 479056253 + ... + 479056256.

Almost surely, 2^1916225018 is an apocalyptic number.

1916225018 is a deficient number, since it is larger than the sum of its proper divisors (958112512).

1916225018 is an equidigital number, since it uses as much as digits as its factorization.

1916225018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958112511.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 1916225018 is about 43774.7075147282. The cubic root of 1916225018 is about 1242.0779021999.

The spelling of 1916225018 in words is "one billion, nine hundred sixteen million, two hundred twenty-five thousand, eighteen".