19910141 has 2 divisors, whose sum is σ = 19910142. Its totient is φ = 19910140.

The previous prime is 19910113. The next prime is 19910147. The reversal of 19910141 is 14101991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16564900 + 3345241 = 4070^2 + 1829^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19910141 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19910141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19910147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9955070 + 9955071.

It is an arithmetic number, because the mean of its divisors is an integer number (9955071).

Almost surely, 2^19910141 is an apocalyptic number.

It is an amenable number.

19910141 is a deficient number, since it is larger than the sum of its proper divisors (1).

19910141 is an equidigital number, since it uses as much as digits as its factorization.

19910141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 19910141 is about 4462.0781033057. The cubic root of 19910141 is about 271.0346265491.

The spelling of 19910141 in words is "nineteen million, nine hundred ten thousand, one hundred forty-one".