231505013534 has 4 divisors (see below), whose sum is σ = 347257520304. Its totient is φ = 115752506766.

The previous prime is 231505013483. The next prime is 231505013539. The reversal of 231505013534 is 435310505132.

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

It is a self number, because there is not a number n which added to its sum of digits gives 231505013534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231505013539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57876253382 + ... + 57876253385.

It is an arithmetic number, because the mean of its divisors is an integer number (86814380076).

Almost surely, 2^231505013534 is an apocalyptic number.

231505013534 is a deficient number, since it is larger than the sum of its proper divisors (115752506770).

231505013534 is a wasteful number, since it uses less digits than its factorization.

231505013534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115752506769.

The product of its (nonzero) digits is 27000, while the sum is 32.

Adding to 231505013534 its reverse (435310505132), we get a palindrome (666815518666).

The spelling of 231505013534 in words is "two hundred thirty-one billion, five hundred five million, thirteen thousand, five hundred thirty-four".