19931447 has 2 divisors, whose sum is σ = 19931448. Its totient is φ = 19931446.

The previous prime is 19931383. The next prime is 19931459. The reversal of 19931447 is 74413991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19931447 - 2⁶ = 19931383 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19931447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19931347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9965723 + 9965724.

It is an arithmetic number, because the mean of its divisors is an integer number (9965724).

Almost surely, 2^19931447 is an apocalyptic number.

19931447 is a deficient number, since it is larger than the sum of its proper divisors (1).

19931447 is an equidigital number, since it uses as much as digits as its factorization.

19931447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 19931447 is about 4464.4649175461. The cubic root of 19931447 is about 271.1312708528.

The spelling of 19931447 in words is "nineteen million, nine hundred thirty-one thousand, four hundred forty-seven".