231405142 has 16 divisors (see below), whose sum is σ = 377164800. Its totient is φ = 106076520.

The previous prime is 231405137. The next prime is 231405157. The reversal of 231405142 is 241504132.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 97042 + ... + 99397.

It is an arithmetic number, because the mean of its divisors is an integer number (23572800).

Almost surely, 2^231405142 is an apocalyptic number.

231405142 is a deficient number, since it is larger than the sum of its proper divisors (145759658).

231405142 is a wasteful number, since it uses less digits than its factorization.

231405142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196491.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 231405142 is about 15212.0065080186. The cubic root of 231405142 is about 613.9377454591.

Adding to 231405142 its reverse (241504132), we get a palindrome (472909274).

It can be divided in two parts, 23140 and 5142, that added together give a palindrome (28282).

The spelling of 231405142 in words is "two hundred thirty-one million, four hundred five thousand, one hundred forty-two".