1916221073 has 16 divisors (see below), whose sum is σ = 2132153856. Its totient is φ = 1710184320.

The previous prime is 1916221049. The next prime is 1916221091. The reversal of 1916221073 is 3701226191.

It is not a de Polignac number, because 1916221073 - 2¹² = 1916216977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1916221273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799565 + ... + 801957.

It is an arithmetic number, because the mean of its divisors is an integer number (133259616).

Almost surely, 2^1916221073 is an apocalyptic number.

1916221073 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1916221073 is a deficient number, since it is larger than the sum of its proper divisors (215932783).

1916221073 is a wasteful number, since it uses less digits than its factorization.

1916221073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1916221073 is about 43774.6624544382. The cubic root of 1916221073 is about 1242.0770498295.

The spelling of 1916221073 in words is "one billion, nine hundred sixteen million, two hundred twenty-one thousand, seventy-three".