291921849 has 6 divisors (see below), whose sum is σ = 421664906. Its totient is φ = 194614560.

The previous prime is 291921829. The next prime is 291921853. The reversal of 291921849 is 948129192.

It can be written as a sum of positive squares in only one way, i.e., 187881849 + 104040000 = 13707^2 + 10200^2 .

It is not a de Polignac number, because 291921849 - 2⁸ = 291921593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291921829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16217872 + ... + 16217889.

Almost surely, 2^291921849 is an apocalyptic number.

It is an amenable number.

291921849 is a deficient number, since it is larger than the sum of its proper divisors (129743057).

291921849 is a wasteful number, since it uses less digits than its factorization.

291921849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32435767 (or 32435764 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 291921849 is about 17085.7206169362. The cubic root of 291921849 is about 663.3695516252.

The spelling of 291921849 in words is "two hundred ninety-one million, nine hundred twenty-one thousand, eight hundred forty-nine".