231705142 has 4 divisors (see below), whose sum is σ = 347557716. Its totient is φ = 115852570.

The previous prime is 231705119. The next prime is 231705143. The reversal of 231705142 is 241507132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231705143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57926284 + ... + 57926287.

It is an arithmetic number, because the mean of its divisors is an integer number (86889429).

Almost surely, 2^231705142 is an apocalyptic number.

231705142 is a deficient number, since it is larger than the sum of its proper divisors (115852574).

231705142 is a wasteful number, since it uses less digits than its factorization.

231705142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115852573.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 231705142 is about 15221.8639463109. The cubic root of 231705142 is about 614.2029394918.

The spelling of 231705142 in words is "two hundred thirty-one million, seven hundred five thousand, one hundred forty-two".