1098969491 has 2 divisors, whose sum is σ = 1098969492. Its totient is φ = 1098969490.

The previous prime is 1098969461. The next prime is 1098969493. The reversal of 1098969491 is 1949698901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1098969491 - 2⁶ = 1098969427 is a prime.

It is a Sophie Germain prime.

Together with 1098969493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1098969493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549484745 + 549484746.

It is an arithmetic number, because the mean of its divisors is an integer number (549484746).

Almost surely, 2^1098969491 is an apocalyptic number.

1098969491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098969491 is an equidigital number, since it uses as much as digits as its factorization.

1098969491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1259712, while the sum is 56.

The square root of 1098969491 is about 33150.7087556209. The cubic root of 1098969491 is about 1031.9576589979.

The spelling of 1098969491 in words is "one billion, ninety-eight million, nine hundred sixty-nine thousand, four hundred ninety-one".