1609168391 has 2 divisors, whose sum is σ = 1609168392. Its totient is φ = 1609168390.

The previous prime is 1609168361. The next prime is 1609168411. The reversal of 1609168391 is 1938619061.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1609168391 - 2¹⁰ = 1609167367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1609168331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804584195 + 804584196.

It is an arithmetic number, because the mean of its divisors is an integer number (804584196).

Almost surely, 2^1609168391 is an apocalyptic number.

1609168391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1609168391 is an equidigital number, since it uses as much as digits as its factorization.

1609168391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 1609168391 is about 40114.4411777106. The cubic root of 1609168391 is about 1171.8368864366.

The spelling of 1609168391 in words is "one billion, six hundred nine million, one hundred sixty-eight thousand, three hundred ninety-one".