1098805949 has 2 divisors, whose sum is σ = 1098805950. Its totient is φ = 1098805948.

The previous prime is 1098805919. The next prime is 1098805991. The reversal of 1098805949 is 9495088901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 573937849 + 524868100 = 23957^2 + 22910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1098805949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1098805949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1098805919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549402974 + 549402975.

It is an arithmetic number, because the mean of its divisors is an integer number (549402975).

Almost surely, 2^1098805949 is an apocalyptic number.

It is an amenable number.

1098805949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098805949 is an equidigital number, since it uses as much as digits as its factorization.

1098805949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 53.

The square root of 1098805949 is about 33148.2420197512. The cubic root of 1098805949 is about 1031.9064665571.

The spelling of 1098805949 in words is "one billion, ninety-eight million, eight hundred five thousand, nine hundred forty-nine".