16209157 has 2 divisors, whose sum is σ = 16209158. Its totient is φ = 16209156.

The previous prime is 16209131. The next prime is 16209169. The reversal of 16209157 is 75190261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15992001 + 217156 = 3999^2 + 466^2 .

It is a cyclic number.

It is not a de Polignac number, because 16209157 - 2⁷ = 16209029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16209107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8104578 + 8104579.

It is an arithmetic number, because the mean of its divisors is an integer number (8104579).

Almost surely, 2^16209157 is an apocalyptic number.

It is an amenable number.

16209157 is a deficient number, since it is larger than the sum of its proper divisors (1).

16209157 is an equidigital number, since it uses as much as digits as its factorization.

16209157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 16209157 is about 4026.0597362682. The cubic root of 16209157 is about 253.0774653818.

The spelling of 16209157 in words is "sixteen million, two hundred nine thousand, one hundred fifty-seven".