19775047 has 2 divisors, whose sum is σ = 19775048. Its totient is φ = 19775046.

The previous prime is 19775023. The next prime is 19775051. The reversal of 19775047 is 74057791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19775047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19775087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9887523 + 9887524.

It is an arithmetic number, because the mean of its divisors is an integer number (9887524).

Almost surely, 2^19775047 is an apocalyptic number.

19775047 is a deficient number, since it is larger than the sum of its proper divisors (1).

19775047 is an equidigital number, since it uses as much as digits as its factorization.

19775047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61740, while the sum is 40.

The square root of 19775047 is about 4446.9143234382. The cubic root of 19775047 is about 270.4202281049.

The spelling of 19775047 in words is "nineteen million, seven hundred seventy-five thousand, forty-seven".