19854061 has 2 divisors, whose sum is σ = 19854062. Its totient is φ = 19854060.

The previous prime is 19854059. The next prime is 19854137. The reversal of 19854061 is 16045891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17065161 + 2788900 = 4131^2 + 1670^2 .

It is an emirp because it is prime and its reverse (16045891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19854061 - 2¹ = 19854059 is a prime.

Together with 19854059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19854041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9927030 + 9927031.

It is an arithmetic number, because the mean of its divisors is an integer number (9927031).

Almost surely, 2^19854061 is an apocalyptic number.

It is an amenable number.

19854061 is a deficient number, since it is larger than the sum of its proper divisors (1).

19854061 is an equidigital number, since it uses as much as digits as its factorization.

19854061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 19854061 is about 4455.7896045482. The cubic root of 19854061 is about 270.7799169026.

The spelling of 19854061 in words is "nineteen million, eight hundred fifty-four thousand, sixty-one".