1098860921 has 2 divisors, whose sum is σ = 1098860922. Its totient is φ = 1098860920.

The previous prime is 1098860887. The next prime is 1098860933. The reversal of 1098860921 is 1290688901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 834343225 + 264517696 = 28885^2 + 16264^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098860921 - 2¹⁸ = 1098598777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1098860951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549430460 + 549430461.

It is an arithmetic number, because the mean of its divisors is an integer number (549430461).

Almost surely, 2^1098860921 is an apocalyptic number.

It is an amenable number.

1098860921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098860921 is an equidigital number, since it uses as much as digits as its factorization.

1098860921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 1098860921 is about 33149.0711936247. The cubic root of 1098860921 is about 1031.9236746353.

The spelling of 1098860921 in words is "one billion, ninety-eight million, eight hundred sixty thousand, nine hundred twenty-one".