1087628909 has 2 divisors, whose sum is σ = 1087628910. Its totient is φ = 1087628908.

The previous prime is 1087628897. The next prime is 1087628917. The reversal of 1087628909 is 9098267801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 822427684 + 265201225 = 28678^2 + 16285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1087628909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1087628939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543814454 + 543814455.

It is an arithmetic number, because the mean of its divisors is an integer number (543814455).

Almost surely, 2^1087628909 is an apocalyptic number.

It is an amenable number.

1087628909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1087628909 is an equidigital number, since it uses as much as digits as its factorization.

1087628909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 1087628909 is about 32979.2193509792. The cubic root of 1087628909 is about 1028.3956892094.

The spelling of 1087628909 in words is "one billion, eighty-seven million, six hundred twenty-eight thousand, nine hundred nine".