19956071 has 2 divisors, whose sum is σ = 19956072. Its totient is φ = 19956070.

The previous prime is 19956067. The next prime is 19956077. The reversal of 19956071 is 17065991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19956071 - 2² = 19956067 is a prime.

It is a Chen prime.

It is equal to p_1267985 and since 19956071 and 1267985 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19956077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9978035 + 9978036.

It is an arithmetic number, because the mean of its divisors is an integer number (9978036).

Almost surely, 2^19956071 is an apocalyptic number.

19956071 is a deficient number, since it is larger than the sum of its proper divisors (1).

19956071 is an equidigital number, since it uses as much as digits as its factorization.

19956071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 19956071 is about 4467.2218436071. The cubic root of 19956071 is about 271.2428798913.

The spelling of 19956071 in words is "nineteen million, nine hundred fifty-six thousand, seventy-one".