19902241 has 2 divisors, whose sum is σ = 19902242. Its totient is φ = 19902240.

The previous prime is 19902221. The next prime is 19902299. The reversal of 19902241 is 14220991.

It is a happy number.

19902241 is nontrivially palindromic in base 16.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14630625 + 5271616 = 3825^2 + 2296^2 .

It is a cyclic number.

It is not a de Polignac number, because 19902241 - 2¹¹ = 19900193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19902221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9951120 + 9951121.

It is an arithmetic number, because the mean of its divisors is an integer number (9951121).

Almost surely, 2^19902241 is an apocalyptic number.

It is an amenable number.

19902241 is a deficient number, since it is larger than the sum of its proper divisors (1).

19902241 is an equidigital number, since it uses as much as digits as its factorization.

19902241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 19902241 is about 4461.1927777221. The cubic root of 19902241 is about 270.9987745209.

The spelling of 19902241 in words is "nineteen million, nine hundred two thousand, two hundred forty-one".