19995497 has 2 divisors, whose sum is σ = 19995498. Its totient is φ = 19995496.

The previous prime is 19995491. The next prime is 19995523. The reversal of 19995497 is 79459991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 379456 = 4429^2 + 616^2 .

It is a cyclic number.

It is not a de Polignac number, because 19995497 - 2⁶ = 19995433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19995491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9997748 + 9997749.

It is an arithmetic number, because the mean of its divisors is an integer number (9997749).

Almost surely, 2^19995497 is an apocalyptic number.

It is an amenable number.

19995497 is a deficient number, since it is larger than the sum of its proper divisors (1).

19995497 is an equidigital number, since it uses as much as digits as its factorization.

19995497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 918540, while the sum is 53.

The square root of 19995497 is about 4471.6324759533. The cubic root of 19995497 is about 271.4213884262.

The spelling of 19995497 in words is "nineteen million, nine hundred ninety-five thousand, four hundred ninety-seven".