16225691 has 2 divisors, whose sum is σ = 16225692. Its totient is φ = 16225690.

The previous prime is 16225687. The next prime is 16225697. The reversal of 16225691 is 19652261.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19652261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16225691 - 2² = 16225687 is a prime.

It is not a weakly prime, because it can be changed into another prime (16225697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8112845 + 8112846.

It is an arithmetic number, because the mean of its divisors is an integer number (8112846).

Almost surely, 2^16225691 is an apocalyptic number.

16225691 is a deficient number, since it is larger than the sum of its proper divisors (1).

16225691 is an equidigital number, since it uses as much as digits as its factorization.

16225691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 16225691 is about 4028.1125853183. The cubic root of 16225691 is about 253.1634859127.

The spelling of 16225691 in words is "sixteen million, two hundred twenty-five thousand, six hundred ninety-one".