16199621 has 2 divisors, whose sum is σ = 16199622. Its totient is φ = 16199620.

The previous prime is 16199593. The next prime is 16199627. The reversal of 16199621 is 12699161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11730625 + 4468996 = 3425^2 + 2114^2 .

It is a cyclic number.

It is not a de Polignac number, because 16199621 - 2²² = 12005317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16199627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8099810 + 8099811.

It is an arithmetic number, because the mean of its divisors is an integer number (8099811).

Almost surely, 2^16199621 is an apocalyptic number.

It is an amenable number.

16199621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16199621 is an equidigital number, since it uses as much as digits as its factorization.

16199621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 35.

The square root of 16199621 is about 4024.8752775707. The cubic root of 16199621 is about 253.0278263592.

The spelling of 16199621 in words is "sixteen million, one hundred ninety-nine thousand, six hundred twenty-one".