391655343851 has 2 divisors, whose sum is σ = 391655343852. Its totient is φ = 391655343850.

The previous prime is 391655343823. The next prime is 391655343941. The reversal of 391655343851 is 158343556193.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391655343851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391655343793 and 391655343802.

It is not a weakly prime, because it can be changed into another prime (391655340851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195827671925 + 195827671926.

It is an arithmetic number, because the mean of its divisors is an integer number (195827671926).

Almost surely, 2^391655343851 is an apocalyptic number.

391655343851 is a deficient number, since it is larger than the sum of its proper divisors (1).

391655343851 is an equidigital number, since it uses as much as digits as its factorization.

391655343851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832000, while the sum is 53.

The spelling of 391655343851 in words is "three hundred ninety-one billion, six hundred fifty-five million, three hundred forty-three thousand, eight hundred fifty-one".