1098621837909 has 6 divisors (see below), whose sum is σ = 1586898210326. Its totient is φ = 732414558600.

The previous prime is 1098621837889. The next prime is 1098621837953. The reversal of 1098621837909 is 9097381268901.

It can be written as a sum of positive squares in only one way, i.e., 710274757284 + 388347080625 = 842778^2 + 623175^2 .

It is not a de Polignac number, because 1098621837909 - 2¹⁶ = 1098621772373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098621832909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61034546542 + ... + 61034546559.

Almost surely, 2^{1098621837909} is an apocalyptic number.

It is an amenable number.

1098621837909 is a deficient number, since it is larger than the sum of its proper divisors (488276372417).

1098621837909 is a wasteful number, since it uses less digits than its factorization.

1098621837909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122069093107 (or 122069093104 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The spelling of 1098621837909 in words is "one trillion, ninety-eight billion, six hundred twenty-one million, eight hundred thirty-seven thousand, nine hundred nine".