131512213633 has 4 divisors (see below), whose sum is σ = 131512951108. Its totient is φ = 131511476160.

The previous prime is 131512213619. The next prime is 131512213667. The reversal of 131512213633 is 336312215131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 28568774529 + 102943439104 = 169023^2 + 320848^2 .

It is a cyclic number.

It is not a de Polignac number, because 131512213633 - 2⁹ = 131512213121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131512213595 and 131512213604.

It is not an unprimeable number, because it can be changed into a prime (131512213603) 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, 84253 + ... + 519733.

It is an arithmetic number, because the mean of its divisors is an integer number (32878237777).

Almost surely, 2^131512213633 is an apocalyptic number.

It is an amenable number.

131512213633 is a deficient number, since it is larger than the sum of its proper divisors (737475).

131512213633 is an equidigital number, since it uses as much as digits as its factorization.

131512213633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737474.

The product of its digits is 9720, while the sum is 31.

Adding to 131512213633 its reverse (336312215131), we get a palindrome (467824428764).

The spelling of 131512213633 in words is "one hundred thirty-one billion, five hundred twelve million, two hundred thirteen thousand, six hundred thirty-three".