1881619 has 2 divisors, whose sum is σ = 1881620. Its totient is φ = 1881618.

The previous prime is 1881617. The next prime is 1881631. The reversal of 1881619 is 9161881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1881619 - 2¹ = 1881617 is a prime.

It is a super-2 number, since 2×1881619² = 7080980122322, which contains 22 as substring.

Together with 1881617, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1881617) 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 as a sum of consecutive naturals, namely, 940809 + 940810.

It is an arithmetic number, because the mean of its divisors is an integer number (940810).

2^1881619 is an apocalyptic number.

1881619 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881619 is an equidigital number, since it uses as much as digits as its factorization.

1881619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 34.

The square root of 1881619 is about 1371.7211815817. The cubic root of 1881619 is about 123.4555342662.

It can be divided in two parts, 1881 and 619, that added together give a square (2500 = 50²).

The spelling of 1881619 in words is "one million, eight hundred eighty-one thousand, six hundred nineteen".