299921661 has 12 divisors (see below), whose sum is σ = 466544988. Its totient is φ = 184567104.

The previous prime is 299921659. The next prime is 299921693. The reversal of 299921661 is 166129992.

It can be written as a sum of positive squares in 2 ways, for example, as 111957561 + 187964100 = 10581^2 + 13710^2 .

It is not a de Polignac number, because 299921661 - 2¹ = 299921659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (299921641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1281600 + ... + 1281833.

It is an arithmetic number, because the mean of its divisors is an integer number (38878749).

Almost surely, 2^299921661 is an apocalyptic number.

It is an amenable number.

299921661 is a deficient number, since it is larger than the sum of its proper divisors (166623327).

299921661 is a wasteful number, since it uses less digits than its factorization.

299921661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563452 (or 2563449 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 299921661 is about 17318.2464758993. The cubic root of 299921661 is about 669.3746753340.

The spelling of 299921661 in words is "two hundred ninety-nine million, nine hundred twenty-one thousand, six hundred sixty-one".