391541147 has 2 divisors, whose sum is σ = 391541148. Its totient is φ = 391541146.

The previous prime is 391541131. The next prime is 391541149. The reversal of 391541147 is 741145193.

It is a strong prime.

It is an emirp because it is prime and its reverse (741145193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 391541147 - 2⁴ = 391541131 is a prime.

Together with 391541149, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (391541149) 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 as a sum of consecutive naturals, namely, 195770573 + 195770574.

It is an arithmetic number, because the mean of its divisors is an integer number (195770574).

Almost surely, 2^391541147 is an apocalyptic number.

391541147 is a deficient number, since it is larger than the sum of its proper divisors (1).

391541147 is an equidigital number, since it uses as much as digits as its factorization.

391541147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 391541147 is about 19787.3986920969. The cubic root of 391541147 is about 731.5754721107.

The spelling of 391541147 in words is "three hundred ninety-one million, five hundred forty-one thousand, one hundred forty-seven".