1919452081 has 4 divisors (see below), whose sum is σ = 1955668212. Its totient is φ = 1883235952.

The previous prime is 1919452069. The next prime is 1919452163. The reversal of 1919452081 is 1802549191.

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 1134611856 + 784840225 = 33684^2 + 28015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1919452081 - 2¹⁷ = 1919321009 is a prime.

It is a super-2 number, since 2×1919452081² = 7368592582510461122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1919452021) 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, 18107986 + ... + 18108091.

It is an arithmetic number, because the mean of its divisors is an integer number (488917053).

Almost surely, 2^1919452081 is an apocalyptic number.

It is an amenable number.

1919452081 is a deficient number, since it is larger than the sum of its proper divisors (36216131).

1919452081 is an equidigital number, since it uses as much as digits as its factorization.

1919452081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36216130.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 1919452081 is about 43811.5519127090. The cubic root of 1919452081 is about 1242.7747611521.

The spelling of 1919452081 in words is "one billion, nine hundred nineteen million, four hundred fifty-two thousand, eighty-one".