231691307242 has 8 divisors (see below), whose sum is σ = 367980311556. Its totient is φ = 109031203392.

The previous prime is 231691307233. The next prime is 231691307249. The reversal of 231691307242 is 242703196132.

It can be written as a sum of positive squares in 2 ways, for example, as 208875506841 + 22815800401 = 457029^2 + 151049^2 .

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 = 231691307195 and 231691307204.

It is not an unprimeable number, because it can be changed into a prime (231691307249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3407225073 + ... + 3407225140.

Almost surely, 2^231691307242 is an apocalyptic number.

231691307242 is a deficient number, since it is larger than the sum of its proper divisors (136289004314).

231691307242 is a wasteful number, since it uses less digits than its factorization.

231691307242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6814450232.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 231691307242 in words is "two hundred thirty-one billion, six hundred ninety-one million, three hundred seven thousand, two hundred forty-two".