19611901 has 2 divisors, whose sum is σ = 19611902. Its totient is φ = 19611900.

The previous prime is 19611883. The next prime is 19611919. The reversal of 19611901 is 10911691.

It is a balanced prime because it is at equal distance from previous prime (19611883) and next prime (19611919).

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 1207801 = 4290^2 + 1099^2 .

It is a cyclic number.

It is not a de Polignac number, because 19611901 - 2¹³ = 19603709 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 19611901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19611001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9805950 + 9805951.

It is an arithmetic number, because the mean of its divisors is an integer number (9805951).

Almost surely, 2^19611901 is an apocalyptic number.

19611901 is the 1981-st centered decagonal number.

It is an amenable number.

19611901 is a deficient number, since it is larger than the sum of its proper divisors (1).

19611901 is an equidigital number, since it uses as much as digits as its factorization.

19611901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 28.

The square root of 19611901 is about 4428.5326012123. The cubic root of 19611901 is about 269.6745094640.

The spelling of 19611901 in words is "nineteen million, six hundred eleven thousand, nine hundred one".