16891541 has 2 divisors, whose sum is σ = 16891542. Its totient is φ = 16891540.

The previous prime is 16891531. The next prime is 16891583. The reversal of 16891541 is 14519861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 4289041 = 3550^2 + 2071^2 .

It is a cyclic number.

It is not a de Polignac number, because 16891541 - 2¹⁸ = 16629397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16891531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8445770 + 8445771.

It is an arithmetic number, because the mean of its divisors is an integer number (8445771).

Almost surely, 2^16891541 is an apocalyptic number.

It is an amenable number.

16891541 is a deficient number, since it is larger than the sum of its proper divisors (1).

16891541 is an equidigital number, since it uses as much as digits as its factorization.

16891541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 35.

The square root of 16891541 is about 4109.9319945712. The cubic root of 16891541 is about 256.5801711883.

The spelling of 16891541 in words is "sixteen million, eight hundred ninety-one thousand, five hundred forty-one".