1304001661 has 8 divisors (see below), whose sum is σ = 1313964000. Its totient is φ = 1294055760.

The previous prime is 1304001623. The next prime is 1304001667. The reversal of 1304001661 is 1661004031.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1304001661 - 2²⁵ = 1270447229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304001667) 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, 188970 + ... + 195748.

It is an arithmetic number, because the mean of its divisors is an integer number (164245500).

Almost surely, 2^1304001661 is an apocalyptic number.

It is an amenable number.

1304001661 is a deficient number, since it is larger than the sum of its proper divisors (9962339).

1304001661 is a wasteful number, since it uses less digits than its factorization.

1304001661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8219.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1304001661 is about 36110.9631690987. The cubic root of 1304001661 is about 1092.5115781265.

Adding to 1304001661 its reverse (1661004031), we get a palindrome (2965005692).

The spelling of 1304001661 in words is "one billion, three hundred four million, one thousand, six hundred sixty-one".