385231531 has 32 divisors (see below), whose sum is σ = 432222336. Its totient is φ = 342144000.

The previous prime is 385231519. The next prime is 385231541. The reversal of 385231531 is 135132583.

It is a cyclic number.

It is not a de Polignac number, because 385231531 - 2⁵ = 385231499 is a prime.

It is a super-2 number, since 2×385231531² = 296806664953207922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 385231493 and 385231502.

It is not an unprimeable number, because it can be changed into a prime (385231501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2128261 + ... + 2128441.

It is an arithmetic number, because the mean of its divisors is an integer number (13506948).

Almost surely, 2^385231531 is an apocalyptic number.

385231531 is a deficient number, since it is larger than the sum of its proper divisors (46990805).

385231531 is a wasteful number, since it uses less digits than its factorization.

385231531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343.

The product of its digits is 10800, while the sum is 31.

The square root of 385231531 is about 19627.3159397815. The cubic root of 385231531 is about 727.6244358340.

The spelling of 385231531 in words is "three hundred eighty-five million, two hundred thirty-one thousand, five hundred thirty-one".