1020091087 has 2 divisors, whose sum is σ = 1020091088. Its totient is φ = 1020091086.

The previous prime is 1020091031. The next prime is 1020091117. The reversal of 1020091087 is 7801900201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020091087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020094087) 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, 510045543 + 510045544.

It is an arithmetic number, because the mean of its divisors is an integer number (510045544).

Almost surely, 2^1020091087 is an apocalyptic number.

1020091087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020091087 is an equidigital number, since it uses as much as digits as its factorization.

1020091087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1020091087 is about 31938.8648358078. The cubic root of 1020091087 is about 1006.6526727998.

Adding to 1020091087 its reverse (7801900201), we get a palindrome (8821991288).

The spelling of 1020091087 in words is "one billion, twenty million, ninety-one thousand, eighty-seven".