391628147 has 2 divisors, whose sum is σ = 391628148. Its totient is φ = 391628146.

The previous prime is 391628141. The next prime is 391628161. The reversal of 391628147 is 741826193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 391628147 - 2¹⁴ = 391611763 is a prime.

It is not a weakly prime, because it can be changed into another prime (391628141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195814073 + 195814074.

It is an arithmetic number, because the mean of its divisors is an integer number (195814074).

Almost surely, 2^391628147 is an apocalyptic number.

391628147 is a deficient number, since it is larger than the sum of its proper divisors (1).

391628147 is an equidigital number, since it uses as much as digits as its factorization.

391628147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 391628147 is about 19789.5969387959. The cubic root of 391628147 is about 731.6296531787.

The spelling of 391628147 in words is "three hundred ninety-one million, six hundred twenty-eight thousand, one hundred forty-seven".