19530281 has 2 divisors, whose sum is σ = 19530282. Its totient is φ = 19530280.

The previous prime is 19530257. The next prime is 19530283. The reversal of 19530281 is 18203591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17774656 + 1755625 = 4216^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 19530281 - 2²² = 15335977 is a prime.

It is a super-2 number, since 2×19530281² = 762863751877922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 19530283, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19530283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9765140 + 9765141.

It is an arithmetic number, because the mean of its divisors is an integer number (9765141).

Almost surely, 2^19530281 is an apocalyptic number.

It is an amenable number.

19530281 is a deficient number, since it is larger than the sum of its proper divisors (1).

19530281 is an equidigital number, since it uses as much as digits as its factorization.

19530281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 19530281 is about 4419.3077512208. The cubic root of 19530281 is about 269.2998825329.

The spelling of 19530281 in words is "nineteen million, five hundred thirty thousand, two hundred eighty-one".