19959097 has 2 divisors, whose sum is σ = 19959098. Its totient is φ = 19959096.

The previous prime is 19959091. The next prime is 19959109. The reversal of 19959097 is 79095991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14107536 + 5851561 = 3756^2 + 2419^2 .

It is a cyclic number.

It is not a de Polignac number, because 19959097 - 2³ = 19959089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19959097.

It is not a weakly prime, because it can be changed into another prime (19959091) 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 as a sum of consecutive naturals, namely, 9979548 + 9979549.

It is an arithmetic number, because the mean of its divisors is an integer number (9979549).

Almost surely, 2^19959097 is an apocalyptic number.

It is an amenable number.

19959097 is a deficient number, since it is larger than the sum of its proper divisors (1).

19959097 is an equidigital number, since it uses as much as digits as its factorization.

19959097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 229635, while the sum is 49.

The square root of 19959097 is about 4467.5605200154. The cubic root of 19959097 is about 271.2565889938.

The spelling of 19959097 in words is "nineteen million, nine hundred fifty-nine thousand, ninety-seven".