1669201291 has 8 divisors (see below), whose sum is σ = 1678976640. Its totient is φ = 1659439488.

The previous prime is 1669201279. The next prime is 1669201301. The reversal of 1669201291 is 1921029661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669201291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1669201291.

It is not an unprimeable number, because it can be changed into a prime (1669201271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344115 + ... + 348931.

It is an arithmetic number, because the mean of its divisors is an integer number (209872080).

Almost surely, 2^1669201291 is an apocalyptic number.

1669201291 is a deficient number, since it is larger than the sum of its proper divisors (9775349).

1669201291 is a wasteful number, since it uses less digits than its factorization.

1669201291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6773.

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

The square root of 1669201291 is about 40855.8599346532. The cubic root of 1669201291 is about 1186.2318229669.

The spelling of 1669201291 in words is "one billion, six hundred sixty-nine million, two hundred one thousand, two hundred ninety-one".