231140142402 has 128 divisors (see below), whose sum is σ = 522468576000. Its totient is φ = 67678765056.

The previous prime is 231140142397. The next prime is 231140142413. The reversal of 231140142402 is 204241041132.

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 63 ways as a sum of consecutive naturals, for example, 56387349 + ... + 56391447.

It is an arithmetic number, because the mean of its divisors is an integer number (4081785750).

Almost surely, 2^231140142402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231140142402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261234288000).

231140142402 is an abundant number, since it is smaller than the sum of its proper divisors (291328433598).

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

231140142402 is a wasteful number, since it uses less digits than its factorization.

231140142402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 231140142402 its reverse (204241041132), we get a palindrome (435381183534).

The spelling of 231140142402 in words is "two hundred thirty-one billion, one hundred forty million, one hundred forty-two thousand, four hundred two".