383947275491 has 16 divisors (see below), whose sum is σ = 421755901728. Its totient is φ = 347362041600.

The previous prime is 383947275461. The next prime is 383947275497. The reversal of 383947275491 is 194572749383.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-383947275491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (383947275497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 638681 + ... + 1084346.

It is an arithmetic number, because the mean of its divisors is an integer number (26359743858).

Almost surely, 2^383947275491 is an apocalyptic number.

383947275491 is a deficient number, since it is larger than the sum of its proper divisors (37808626237).

383947275491 is a wasteful number, since it uses less digits than its factorization.

383947275491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723382.

The product of its digits is 45722880, while the sum is 62.

The spelling of 383947275491 in words is "three hundred eighty-three billion, nine hundred forty-seven million, two hundred seventy-five thousand, four hundred ninety-one".