19980901 has 4 divisors (see below), whose sum is σ = 19989900. Its totient is φ = 19971904.

The previous prime is 19980889. The next prime is 19980907. The reversal of 19980901 is 10908991.

It is a Cunningham number, because it is equal to 4470²+1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10908991 = 953 ⋅11447.

It can be written as a sum of positive squares in 2 ways, for example, as 9424900 + 10556001 = 3070^2 + 3249^2 .

It is a cyclic number.

It is not a de Polignac number, because 19980901 - 2⁵ = 19980869 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 (19980907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1485 + ... + 6493.

It is an arithmetic number, because the mean of its divisors is an integer number (4997475).

Almost surely, 2^19980901 is an apocalyptic number.

It is an amenable number.

19980901 is a deficient number, since it is larger than the sum of its proper divisors (8999).

19980901 is an equidigital number, since it uses as much as digits as its factorization.

19980901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8998.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 19980901 is about 4470.0001118568. Note that the first 3 decimals coincide. The cubic root of 19980901 is about 271.3553297042.

The spelling of 19980901 in words is "nineteen million, nine hundred eighty thousand, nine hundred one".