1587788381 has 2 divisors, whose sum is σ = 1587788382. Its totient is φ = 1587788380.

The previous prime is 1587788369. The next prime is 1587788383. The reversal of 1587788381 is 1838877851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1185424900 + 402363481 = 34430^2 + 20059^2 .

It is a cyclic number.

It is not a de Polignac number, because 1587788381 - 2⁶ = 1587788317 is a prime.

It is a super-2 number, since 2×1587788381² = 5042143885677202322, which contains 22 as substring.

Together with 1587788383, 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 (1587788383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 793894190 + 793894191.

It is an arithmetic number, because the mean of its divisors is an integer number (793894191).

Almost surely, 2^1587788381 is an apocalyptic number.

It is an amenable number.

1587788381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1587788381 is an equidigital number, since it uses as much as digits as its factorization.

1587788381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3010560, while the sum is 56.

The square root of 1587788381 is about 39847.0623885877. The cubic root of 1587788381 is about 1166.6239103333.

The spelling of 1587788381 in words is "one billion, five hundred eighty-seven million, seven hundred eighty-eight thousand, three hundred eighty-one".