1098662891 has 2 divisors, whose sum is σ = 1098662892. Its totient is φ = 1098662890.

The previous prime is 1098662801. The next prime is 1098662933. The reversal of 1098662891 is 1982668901.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1982668901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1098662891 - 2²² = 1094468587 is a prime.

It is not a weakly prime, because it can be changed into another prime (1098662801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549331445 + 549331446.

It is an arithmetic number, because the mean of its divisors is an integer number (549331446).

Almost surely, 2^1098662891 is an apocalyptic number.

1098662891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098662891 is an equidigital number, since it uses as much as digits as its factorization.

1098662891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 1098662891 is about 33146.0840975220. The cubic root of 1098662891 is about 1031.8616819184.

The spelling of 1098662891 in words is "one billion, ninety-eight million, six hundred sixty-two thousand, eight hundred ninety-one".