19888061 has 2 divisors, whose sum is σ = 19888062. Its totient is φ = 19888060.

The previous prime is 19888021. The next prime is 19888067. The reversal of 19888061 is 16088891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17347225 + 2540836 = 4165^2 + 1594^2 .

It is a cyclic number.

It is not a de Polignac number, because 19888061 - 2²² = 15693757 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 (19888067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9944030 + 9944031.

It is an arithmetic number, because the mean of its divisors is an integer number (9944031).

Almost surely, 2^19888061 is an apocalyptic number.

It is an amenable number.

19888061 is a deficient number, since it is larger than the sum of its proper divisors (1).

19888061 is an equidigital number, since it uses as much as digits as its factorization.

19888061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 19888061 is about 4459.6032334727. The cubic root of 19888061 is about 270.9343985943.

The spelling of 19888061 in words is "nineteen million, eight hundred eighty-eight thousand, sixty-one".