1669414391 has 2 divisors, whose sum is σ = 1669414392. Its totient is φ = 1669414390.

The previous prime is 1669414361. The next prime is 1669414403. The reversal of 1669414391 is 1934149661.

It is a strong prime.

It is an emirp because it is prime and its reverse (1934149661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1669414391 - 2¹⁰ = 1669413367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669414361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834707195 + 834707196.

It is an arithmetic number, because the mean of its divisors is an integer number (834707196).

Almost surely, 2^1669414391 is an apocalyptic number.

1669414391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669414391 is an equidigital number, since it uses as much as digits as its factorization.

1669414391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 1669414391 is about 40858.4678004450. The cubic root of 1669414391 is about 1186.2823012498.

The spelling of 1669414391 in words is "one billion, six hundred sixty-nine million, four hundred fourteen thousand, three hundred ninety-one".