391055849 has 8 divisors (see below), whose sum is σ = 401893320. Its totient is φ = 380232576.

The previous prime is 391055843. The next prime is 391055887. The reversal of 391055849 is 948550193.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 168091225 + 222964624 = 12965^2 + 14932^2 .

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 391055849 - 2¹² = 391051753 is a prime.

It is a super-2 number, since 2×391055849² = 305849354074221602, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (391055843) 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, 77207 + ... + 82115.

It is an arithmetic number, because the mean of its divisors is an integer number (50236665).

Almost surely, 2^391055849 is an apocalyptic number.

It is an amenable number.

391055849 is a deficient number, since it is larger than the sum of its proper divisors (10837471).

391055849 is a wasteful number, since it uses less digits than its factorization.

391055849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7099.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 391055849 is about 19775.1320855260. The cubic root of 391055849 is about 731.2730952941.

The spelling of 391055849 in words is "three hundred ninety-one million, fifty-five thousand, eight hundred forty-nine".