385906743531 has 16 divisors (see below), whose sum is σ = 579545391520. Its totient is φ = 253746898560.

The previous prime is 385906743511. The next prime is 385906743557. The reversal of 385906743531 is 135347609583.

385906743531 is a `hidden beast` number, since 3 + 8 + 5 + 9 + 0 + 67 + 43 + 531 = 666.

It is not a de Polignac number, because 385906743531 - 2¹¹ = 385906741483 is a prime.

It is a super-2 number, since 2×385906743531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385906743511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97894210 + ... + 97898151.

It is an arithmetic number, because the mean of its divisors is an integer number (36221586970).

Almost surely, 2^385906743531 is an apocalyptic number.

385906743531 is a deficient number, since it is larger than the sum of its proper divisors (193638647989).

385906743531 is a wasteful number, since it uses less digits than its factorization.

385906743531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195792443 (or 195792437 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 54.

The spelling of 385906743531 in words is "three hundred eighty-five billion, nine hundred six million, seven hundred forty-three thousand, five hundred thirty-one".