231861542 has 8 divisors (see below), whose sum is σ = 379409832. Its totient is φ = 105391600.

The previous prime is 231861533. The next prime is 231861571. The reversal of 231861542 is 245168132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 231861499 and 231861508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5269559 + ... + 5269602.

It is an arithmetic number, because the mean of its divisors is an integer number (47426229).

Almost surely, 2^231861542 is an apocalyptic number.

231861542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

231861542 is a deficient number, since it is larger than the sum of its proper divisors (147548290).

231861542 is a wasteful number, since it uses less digits than its factorization.

231861542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10539174.

The product of its digits is 11520, while the sum is 32.

The square root of 231861542 is about 15227.0004268733. Note that the first 3 decimals coincide. The cubic root of 231861542 is about 614.3411032133.

The spelling of 231861542 in words is "two hundred thirty-one million, eight hundred sixty-one thousand, five hundred forty-two".