1881389087 has 2 divisors, whose sum is σ = 1881389088. Its totient is φ = 1881389086.

The previous prime is 1881389077. The next prime is 1881389089. The reversal of 1881389087 is 7809831881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1881389087 is a prime.

Together with 1881389089, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881389089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940694543 + 940694544.

It is an arithmetic number, because the mean of its divisors is an integer number (940694544).

Almost surely, 2^1881389087 is an apocalyptic number.

1881389087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881389087 is an equidigital number, since it uses as much as digits as its factorization.

1881389087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 53.

The square root of 1881389087 is about 43374.9822708897. The cubic root of 1881389087 is about 1234.5050576177.

The spelling of 1881389087 in words is "one billion, eight hundred eighty-one million, three hundred eighty-nine thousand, eighty-seven".