3919081 has 2 divisors, whose sum is σ = 3919082. Its totient is φ = 3919080.

The previous prime is 3919079. The next prime is 3919087. The reversal of 3919081 is 1809193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3080025 + 839056 = 1755^2 + 916^2 .

It is an emirp because it is prime and its reverse (1809193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3919081 - 2¹ = 3919079 is a prime.

It is a super-2 number, since 2×3919081² = 30718391769122, which contains 22 as substring.

Together with 3919079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3919087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1959540 + 1959541.

It is an arithmetic number, because the mean of its divisors is an integer number (1959541).

Almost surely, 2^3919081 is an apocalyptic number.

It is an amenable number.

3919081 is a deficient number, since it is larger than the sum of its proper divisors (1).

3919081 is an equidigital number, since it uses as much as digits as its factorization.

3919081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 3919081 is about 1979.6668911713. Note that the first 3 decimals coincide. The cubic root of 3919081 is about 157.6623806110.

The spelling of 3919081 in words is "three million, nine hundred nineteen thousand, eighty-one".