19966951 has 2 divisors, whose sum is σ = 19966952. Its totient is φ = 19966950.

The previous prime is 19966943. The next prime is 19967047. The reversal of 19966951 is 15966991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19966951 - 2³ = 19966943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19966901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9983475 + 9983476.

It is an arithmetic number, because the mean of its divisors is an integer number (9983476).

Almost surely, 2^19966951 is an apocalyptic number.

19966951 is a deficient number, since it is larger than the sum of its proper divisors (1).

19966951 is an equidigital number, since it uses as much as digits as its factorization.

19966951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 46.

The square root of 19966951 is about 4468.4394367609. The cubic root of 19966951 is about 271.2921645823.

The spelling of 19966951 in words is "nineteen million, nine hundred sixty-six thousand, nine hundred fifty-one".