1619338081 has 3 divisors (see below), whose sum is σ = 1619378323. Its totient is φ = 1619297840.

The previous prime is 1619338067. The next prime is 1619338121. The reversal of 1619338081 is 1808339161.

The square root of 1619338081 is 40241.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1808339161 = 11351 ⋅159311.

It can be written as a sum of positive squares in only one way, i.e., 120099681 + 1499238400 = 10959^2 + 38720^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1619338081 is a prime.

It is a super-2 number, since 2×1619338081² = 5244511641153525122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1619338181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 20121 + ... + 60361.

Almost surely, 2^1619338081 is an apocalyptic number.

1619338081 is the 40241-st square number.

1619338081 is the 20121-st centered octagonal number.

It is an amenable number.

1619338081 is a deficient number, since it is larger than the sum of its proper divisors (40242).

1619338081 is an frugal number, since it uses more digits than its factorization.

1619338081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80482 (or 40241 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The cubic root of 1619338081 is about 1174.3003122096.

The spelling of 1619338081 in words is "one billion, six hundred nineteen million, three hundred thirty-eight thousand, eighty-one".