6347395981 has 4 divisors (see below), whose sum is σ = 6347666592. Its totient is φ = 6347125372.

The previous prime is 6347395973. The next prime is 6347396051. The reversal of 6347395981 is 1895937436.

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 6347395981 - 2³ = 6347395973 is a prime.

It is a super-3 number, since 3×6347395981³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6347393981) 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, 96391 + ... + 148276.

It is an arithmetic number, because the mean of its divisors is an integer number (1586916648).

Almost surely, 2^6347395981 is an apocalyptic number.

It is an amenable number.

6347395981 is a deficient number, since it is larger than the sum of its proper divisors (270611).

6347395981 is a wasteful number, since it uses less digits than its factorization.

6347395981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270610.

The product of its digits is 4898880, while the sum is 55.

The square root of 6347395981 is about 79670.5465087318. The cubic root of 6347395981 is about 1851.5347362872.

The spelling of 6347395981 in words is "six billion, three hundred forty-seven million, three hundred ninety-five thousand, nine hundred eighty-one".