231140542 has 4 divisors (see below), whose sum is σ = 346710816. Its totient is φ = 115570270.

The previous prime is 231140537. The next prime is 231140543. The reversal of 231140542 is 245041132.

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 (231140543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57785134 + ... + 57785137.

It is an arithmetic number, because the mean of its divisors is an integer number (86677704).

Almost surely, 2^231140542 is an apocalyptic number.

231140542 is a deficient number, since it is larger than the sum of its proper divisors (115570274).

231140542 is a wasteful number, since it uses less digits than its factorization.

231140542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115570273.

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

The square root of 231140542 is about 15203.3069428990. The cubic root of 231140542 is about 613.7036540263.

Adding to 231140542 its reverse (245041132), we get a palindrome (476181674).

The spelling of 231140542 in words is "two hundred thirty-one million, one hundred forty thousand, five hundred forty-two".