19916087 has 2 divisors, whose sum is σ = 19916088. Its totient is φ = 19916086.

The previous prime is 19916053. The next prime is 19916173. The reversal of 19916087 is 78061991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19916087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19916387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9958043 + 9958044.

It is an arithmetic number, because the mean of its divisors is an integer number (9958044).

Almost surely, 2^19916087 is an apocalyptic number.

19916087 is a deficient number, since it is larger than the sum of its proper divisors (1).

19916087 is an equidigital number, since it uses as much as digits as its factorization.

19916087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 19916087 is about 4462.7443350477. The cubic root of 19916087 is about 271.0616046183.

The spelling of 19916087 in words is "nineteen million, nine hundred sixteen thousand, eighty-seven".