1098999998901 has 80 divisors (see below), whose sum is σ = 1939235706496. Its totient is φ = 607133314944.

The previous prime is 1098999998821. The next prime is 1098999998909.

1098999998901 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1098999998901 - 2⁷ = 1098999998773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098999998909) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3126870 + ... + 3460536.

Almost surely, 2^{1098999998901} is an apocalyptic number.

It is an amenable number.

1098999998901 is a deficient number, since it is larger than the sum of its proper divisors (840235707595).

1098999998901 is a wasteful number, since it uses less digits than its factorization.

1098999998901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333880 (or 333871 counting only the distinct ones).

The product of its (nonzero) digits is 306110016, while the sum is 81.

It can be divided in two parts, 10989999 and 98901, that added together give a square (11088900 = 3330²).

The spelling of 1098999998901 in words is "one trillion, ninety-eight billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, nine hundred one".