231550235123513 has 16 divisors (see below), whose sum is σ = 249797944311696. Its totient is φ = 213816689848320.

The previous prime is 231550235123423. The next prime is 231550235123539. The reversal of 231550235123513 is 315321532055132.

It can be written as a sum of positive squares in 8 ways, for example, as 77900253036544 + 153649982086969 = 8826112^2 + 12395563^2 .

It is a cyclic number.

It is not a de Polignac number, because 231550235123513 - 2¹⁸ = 231550234861369 is a prime.

It is a super-2 number, since 2×231550235123513² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231550235123593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224711633 + ... + 225739713.

It is an arithmetic number, because the mean of its divisors is an integer number (15612371519481).

Almost surely, 2^{231550235123513} is an apocalyptic number.

It is an amenable number.

231550235123513 is a deficient number, since it is larger than the sum of its proper divisors (18247709188183).

231550235123513 is a wasteful number, since it uses less digits than its factorization.

231550235123513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278124.

The product of its (nonzero) digits is 405000, while the sum is 41.

Adding to 231550235123513 its reverse (315321532055132), we get a palindrome (546871767178645).

The spelling of 231550235123513 in words is "two hundred thirty-one trillion, five hundred fifty billion, two hundred thirty-five million, one hundred twenty-three thousand, five hundred thirteen".