395053821917 has 4 divisors (see below), whose sum is σ = 395143795296. Its totient is φ = 394963848540.

The previous prime is 395053821913. The next prime is 395053821937. The reversal of 395053821917 is 719128350593.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 395053821917 - 2² = 395053821913 is a prime.

It is a super-2 number, since 2×395053821917² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395053821913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44980103 + ... + 44988884.

It is an arithmetic number, because the mean of its divisors is an integer number (98785948824).

Almost surely, 2^395053821917 is an apocalyptic number.

It is an amenable number.

395053821917 is a deficient number, since it is larger than the sum of its proper divisors (89973379).

395053821917 is an equidigital number, since it uses as much as digits as its factorization.

395053821917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89973378.

The product of its (nonzero) digits is 2041200, while the sum is 53.

The spelling of 395053821917 in words is "three hundred ninety-five billion, fifty-three million, eight hundred twenty-one thousand, nine hundred seventeen".