391481017 has 2 divisors, whose sum is σ = 391481018. Its totient is φ = 391481016.

The previous prime is 391481011. The next prime is 391481029. The reversal of 391481017 is 710184193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303421561 + 88059456 = 17419^2 + 9384^2 .

It is a cyclic number.

It is not a de Polignac number, because 391481017 - 2¹⁹ = 390956729 is a prime.

It is not a weakly prime, because it can be changed into another prime (391481011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195740508 + 195740509.

It is an arithmetic number, because the mean of its divisors is an integer number (195740509).

Almost surely, 2^391481017 is an apocalyptic number.

It is an amenable number.

391481017 is a deficient number, since it is larger than the sum of its proper divisors (1).

391481017 is an equidigital number, since it uses as much as digits as its factorization.

391481017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 391481017 is about 19785.8792324223. The cubic root of 391481017 is about 731.5380202060.

The spelling of 391481017 in words is "three hundred ninety-one million, four hundred eighty-one thousand, seventeen".