1009088891 has 2 divisors, whose sum is σ = 1009088892. Its totient is φ = 1009088890.

The previous prime is 1009088863. The next prime is 1009088897. The reversal of 1009088891 is 1988809001.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1988809001) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1688806001 and 1006088861.

It is a cyclic number.

It is not a de Polignac number, because 1009088891 - 2¹⁴ = 1009072507 is a prime.

It is not a weakly prime, because it can be changed into another prime (1009088897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504544445 + 504544446.

It is an arithmetic number, because the mean of its divisors is an integer number (504544446).

Almost surely, 2^1009088891 is an apocalyptic number.

1009088891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009088891 is an equidigital number, since it uses as much as digits as its factorization.

1009088891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 1009088891 is about 31766.1595255076. The cubic root of 1009088891 is about 1003.0204977410.

The spelling of 1009088891 in words is "one billion, nine million, eighty-eight thousand, eight hundred ninety-one".