231541787145133 has 4 divisors (see below), whose sum is σ = 231823811247228. Its totient is φ = 231259763043040.

The previous prime is 231541787145107. The next prime is 231541787145167. The reversal of 231541787145133 is 331541787145132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 164444768254404 + 67097018890729 = 12823602^2 + 8191277^2 .

It is a cyclic number.

It is not a de Polignac number, because 231541787145133 - 2³³ = 231533197210541 is a prime.

It is a super-2 number, since 2×231541787145133² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231541787145433) 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, 141012049816 + ... + 141012051457.

It is an arithmetic number, because the mean of its divisors is an integer number (57955952811807).

Almost surely, 2^{231541787145133} is an apocalyptic number.

It is an amenable number.

231541787145133 is a deficient number, since it is larger than the sum of its proper divisors (282024102095).

231541787145133 is an equidigital number, since it uses as much as digits as its factorization.

231541787145133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282024102094.

The product of its digits is 8467200, while the sum is 55.

Subtracting 231541787145133 from its reverse (331541787145132), we obtain a palindrome (99999999999999).

The spelling of 231541787145133 in words is "two hundred thirty-one trillion, five hundred forty-one billion, seven hundred eighty-seven million, one hundred forty-five thousand, one hundred thirty-three".