391349121 has 8 divisors (see below), whose sum is σ = 522765504. Its totient is φ = 260416080.

The previous prime is 391349107. The next prime is 391349143. The reversal of 391349121 is 121943193.

It is a happy number.

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

It is not a de Polignac number, because 391349121 - 2¹⁴ = 391332737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (391349521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118941 + ... + 122186.

It is an arithmetic number, because the mean of its divisors is an integer number (65345688).

Almost surely, 2^391349121 is an apocalyptic number.

It is an amenable number.

391349121 is a deficient number, since it is larger than the sum of its proper divisors (131416383).

391349121 is a wasteful number, since it uses less digits than its factorization.

391349121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241671.

The product of its digits is 5832, while the sum is 33.

The square root of 391349121 is about 19782.5458675065. The cubic root of 391349121 is about 731.4558554926.

The spelling of 391349121 in words is "three hundred ninety-one million, three hundred forty-nine thousand, one hundred twenty-one".