19481797 has 2 divisors, whose sum is σ = 19481798. Its totient is φ = 19481796.

The previous prime is 19481743. The next prime is 19481801. The reversal of 19481797 is 79718491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16924996 + 2556801 = 4114^2 + 1599^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19481797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19481197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9740898 + 9740899.

It is an arithmetic number, because the mean of its divisors is an integer number (9740899).

Almost surely, 2^19481797 is an apocalyptic number.

It is an amenable number.

19481797 is a deficient number, since it is larger than the sum of its proper divisors (1).

19481797 is an equidigital number, since it uses as much as digits as its factorization.

19481797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 46.

The square root of 19481797 is about 4413.8188680552. The cubic root of 19481797 is about 269.0768518642.

It can be divided in two parts, 1948179 and 7, that multiplied together give a triangular number (13637253 = T₅₂₂₂).

The spelling of 19481797 in words is "nineteen million, four hundred eighty-one thousand, seven hundred ninety-seven".