199621469 has 2 divisors, whose sum is σ = 199621470. Its totient is φ = 199621468.

The previous prime is 199621459. The next prime is 199621481. The reversal of 199621469 is 964126991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103836100 + 95785369 = 10190^2 + 9787^2 .

It is a cyclic number.

It is not a de Polignac number, because 199621469 - 2⁴ = 199621453 is a prime.

It is a super-2 number, since 2×199621469² = 79697461771435922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199621459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99810734 + 99810735.

It is an arithmetic number, because the mean of its divisors is an integer number (99810735).

Almost surely, 2^199621469 is an apocalyptic number.

It is an amenable number.

199621469 is a deficient number, since it is larger than the sum of its proper divisors (1).

199621469 is an equidigital number, since it uses as much as digits as its factorization.

199621469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 199621469 is about 14128.7461934879. The cubic root of 199621469 is about 584.4343708503.

The spelling of 199621469 in words is "one hundred ninety-nine million, six hundred twenty-one thousand, four hundred sixty-nine".