16642091 has 2 divisors, whose sum is σ = 16642092. Its totient is φ = 16642090.

The previous prime is 16642069. The next prime is 16642097. The reversal of 16642091 is 19024661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16642091 - 2¹⁰ = 16641067 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16642097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321045 + 8321046.

It is an arithmetic number, because the mean of its divisors is an integer number (8321046).

Almost surely, 2^16642091 is an apocalyptic number.

16642091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16642091 is an equidigital number, since it uses as much as digits as its factorization.

16642091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 16642091 is about 4079.4719020971. The cubic root of 16642091 is about 255.3108652697.

The spelling of 16642091 in words is "sixteen million, six hundred forty-two thousand, ninety-one".