16557091 has 2 divisors, whose sum is σ = 16557092. Its totient is φ = 16557090.

The previous prime is 16557083. The next prime is 16557103. The reversal of 16557091 is 19075561.

16557091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16557091 - 2³ = 16557083 is a prime.

It is not a weakly prime, because it can be changed into another prime (16557001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278545 + 8278546.

It is an arithmetic number, because the mean of its divisors is an integer number (8278546).

Almost surely, 2^16557091 is an apocalyptic number.

16557091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16557091 is an equidigital number, since it uses as much as digits as its factorization.

16557091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 16557091 is about 4069.0405503018. The cubic root of 16557091 is about 254.8754537251.

The spelling of 16557091 in words is "sixteen million, five hundred fifty-seven thousand, ninety-one".