18997101 has 12 divisors (see below), whose sum is σ = 27698112. Its totient is φ = 12545736.

The previous prime is 18997087. The next prime is 18997129. The reversal of 18997101 is 10179981.

It is not a de Polignac number, because 18997101 - 2⁹ = 18996589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18997151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8901 + ... + 10826.

It is an arithmetic number, because the mean of its divisors is an integer number (2308176).

Almost surely, 2^18997101 is an apocalyptic number.

It is an amenable number.

18997101 is a deficient number, since it is larger than the sum of its proper divisors (8701011).

18997101 is a wasteful number, since it uses less digits than its factorization.

18997101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19840 (or 19837 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

The square root of 18997101 is about 4358.5663927489. The cubic root of 18997101 is about 266.8265927847.

The spelling of 18997101 in words is "eighteen million, nine hundred ninety-seven thousand, one hundred one".