16398091 has 2 divisors, whose sum is σ = 16398092. Its totient is φ = 16398090.

The previous prime is 16398017. The next prime is 16398119. The reversal of 16398091 is 19089361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16398091 - 2¹¹ = 16396043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16398091.

It is not a weakly prime, because it can be changed into another prime (16398001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8199045 + 8199046.

It is an arithmetic number, because the mean of its divisors is an integer number (8199046).

Almost surely, 2^16398091 is an apocalyptic number.

16398091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16398091 is an equidigital number, since it uses as much as digits as its factorization.

16398091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 16398091 is about 4049.4556424290. The cubic root of 16398091 is about 254.0569601729.

It can be divided in two parts, 1639 and 8091, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 16398091 in words is "sixteen million, three hundred ninety-eight thousand, ninety-one".