19953497 has 2 divisors, whose sum is σ = 19953498. Its totient is φ = 19953496.

The previous prime is 19953407. The next prime is 19953499. The reversal of 19953497 is 79435991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11978521 + 7974976 = 3461^2 + 2824^2 .

It is a cyclic number.

It is not a de Polignac number, because 19953497 - 2²² = 15759193 is a prime.

Together with 19953499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19953499) 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, 9976748 + 9976749.

It is an arithmetic number, because the mean of its divisors is an integer number (9976749).

Almost surely, 2^19953497 is an apocalyptic number.

It is an amenable number.

19953497 is a deficient number, since it is larger than the sum of its proper divisors (1).

19953497 is an equidigital number, since it uses as much as digits as its factorization.

19953497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 47.

The square root of 19953497 is about 4466.9337357968. The cubic root of 19953497 is about 271.2312174554.

The spelling of 19953497 in words is "nineteen million, nine hundred fifty-three thousand, four hundred ninety-seven".