19881101 has 2 divisors, whose sum is σ = 19881102. Its totient is φ = 19881100.

The previous prime is 19881097. The next prime is 19881133. The reversal of 19881101 is 10118891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11383876 + 8497225 = 3374^2 + 2915^2 .

It is a cyclic number.

It is not a de Polignac number, because 19881101 - 2² = 19881097 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19881151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940550 + 9940551.

It is an arithmetic number, because the mean of its divisors is an integer number (9940551).

Almost surely, 2^19881101 is an apocalyptic number.

It is an amenable number.

19881101 is a deficient number, since it is larger than the sum of its proper divisors (1).

19881101 is an equidigital number, since it uses as much as digits as its factorization.

19881101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 29.

The square root of 19881101 is about 4458.8228267111. The cubic root of 19881101 is about 270.9027896233.

Adding to 19881101 its reverse (10118891), we get a palindrome (29999992).

The spelling of 19881101 in words is "nineteen million, eight hundred eighty-one thousand, one hundred one".