231685542 has 32 divisors (see below), whose sum is σ = 561663360. Its totient is φ = 70207560.

The previous prime is 231685541. The next prime is 231685543. The reversal of 231685542 is 245586132.

231685542 is a `hidden beast` number, since 2 + 31 + 6 + 85 + 542 = 666.

It is an interprime number because it is at equal distance from previous prime (231685541) and next prime (231685543).

It is a junction number, because it is equal to n+sod(n) for n = 231685497 and 231685506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231685541) 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, 194428 + ... + 195615.

It is an arithmetic number, because the mean of its divisors is an integer number (17551980).

Almost surely, 2^231685542 is an apocalyptic number.

231685542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

231685542 is an abundant number, since it is smaller than the sum of its proper divisors (329977818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231685542 is a wasteful number, since it uses less digits than its factorization.

231685542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390065 (or 390059 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 231685542 is about 15221.2201219219. The cubic root of 231685542 is about 614.1856204730.

The spelling of 231685542 in words is "two hundred thirty-one million, six hundred eighty-five thousand, five hundred forty-two".