391084137 has 6 divisors (see below), whose sum is σ = 564899322. Its totient is φ = 260722752.

The previous prime is 391084129. The next prime is 391084147. The reversal of 391084137 is 731480193.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 384003216 + 7080921 = 19596^2 + 2661^2 .

It is not a de Polignac number, because 391084137 - 2³ = 391084129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (391084147) 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, 21726888 + ... + 21726905.

It is an arithmetic number, because the mean of its divisors is an integer number (94149887).

Almost surely, 2^391084137 is an apocalyptic number.

It is an amenable number.

391084137 is a deficient number, since it is larger than the sum of its proper divisors (173815185).

391084137 is a wasteful number, since it uses less digits than its factorization.

391084137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43453799 (or 43453796 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 391084137 is about 19775.8473143378. The cubic root of 391084137 is about 731.2907276899.

The spelling of 391084137 in words is "three hundred ninety-one million, eighty-four thousand, one hundred thirty-seven".