19945151 has 2 divisors, whose sum is σ = 19945152. Its totient is φ = 19945150.

The previous prime is 19945141. The next prime is 19945153. The reversal of 19945151 is 15154991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19945151 - 2¹⁸ = 19683007 is a prime.

Together with 19945153, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19945153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9972575 + 9972576.

It is an arithmetic number, because the mean of its divisors is an integer number (9972576).

Almost surely, 2^19945151 is an apocalyptic number.

19945151 is a deficient number, since it is larger than the sum of its proper divisors (1).

19945151 is an equidigital number, since it uses as much as digits as its factorization.

19945151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 35.

The square root of 19945151 is about 4465.9994402149. Note that the first 3 decimals coincide. The cubic root of 19945151 is about 271.1933959910.

The spelling of 19945151 in words is "nineteen million, nine hundred forty-five thousand, one hundred fifty-one".