391448471 has 2 divisors, whose sum is σ = 391448472. Its totient is φ = 391448470.

The previous prime is 391448461. The next prime is 391448483. The reversal of 391448471 is 174844193.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391448471 is a prime.

It is a super-3 number, since 3×391448471³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391448461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195724235 + 195724236.

It is an arithmetic number, because the mean of its divisors is an integer number (195724236).

Almost surely, 2^391448471 is an apocalyptic number.

391448471 is a deficient number, since it is larger than the sum of its proper divisors (1).

391448471 is an equidigital number, since it uses as much as digits as its factorization.

391448471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 391448471 is about 19785.0567600904. The cubic root of 391448471 is about 731.5177473659.

The spelling of 391448471 in words is "three hundred ninety-one million, four hundred forty-eight thousand, four hundred seventy-one".