19948997 has 2 divisors, whose sum is σ = 19948998. Its totient is φ = 19948996.

The previous prime is 19948991. The next prime is 19949011. The reversal of 19948997 is 79984991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10407076 + 9541921 = 3226^2 + 3089^2 .

It is a cyclic number.

It is not a de Polignac number, because 19948997 - 2²² = 15754693 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 (19948991) 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, 9974498 + 9974499.

It is an arithmetic number, because the mean of its divisors is an integer number (9974499).

Almost surely, 2^19948997 is an apocalyptic number.

It is an amenable number.

19948997 is a deficient number, since it is larger than the sum of its proper divisors (1).

19948997 is an equidigital number, since it uses as much as digits as its factorization.

19948997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 56.

The square root of 19948997 is about 4466.4300061682. The cubic root of 19948997 is about 271.2108261719.

The spelling of 19948997 in words is "nineteen million, nine hundred forty-eight thousand, nine hundred ninety-seven".