19790101 has 2 divisors, whose sum is σ = 19790102. Its totient is φ = 19790100.

The previous prime is 19790063. The next prime is 19790107. The reversal of 19790101 is 10109791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11553201 + 8236900 = 3399^2 + 2870^2 .

It is a cyclic number.

It is not a de Polignac number, because 19790101 - 2¹⁵ = 19757333 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19790101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19790107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9895050 + 9895051.

It is an arithmetic number, because the mean of its divisors is an integer number (9895051).

Almost surely, 2^19790101 is an apocalyptic number.

It is an amenable number.

19790101 is a deficient number, since it is larger than the sum of its proper divisors (1).

19790101 is an equidigital number, since it uses as much as digits as its factorization.

19790101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 28.

The square root of 19790101 is about 4448.6066357906. The cubic root of 19790101 is about 270.4888309514.

Adding to 19790101 its reverse (10109791), we get a palindrome (29899892).

It can be divided in two parts, 19790 and 101, that added together give a palindrome (19891).

The spelling of 19790101 in words is "nineteen million, seven hundred ninety thousand, one hundred one".