131561611305 has 8 divisors (see below), whose sum is σ = 210498578112. Its totient is φ = 70166192688.

The previous prime is 131561611303. The next prime is 131561611331. The reversal of 131561611305 is 503116165131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131561611305 - 2¹ = 131561611303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131561611301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4385387029 + ... + 4385387058.

It is an arithmetic number, because the mean of its divisors is an integer number (26312322264).

Almost surely, 2^131561611305 is an apocalyptic number.

131561611305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131561611305 is a deficient number, since it is larger than the sum of its proper divisors (78936966807).

131561611305 is an equidigital number, since it uses as much as digits as its factorization.

131561611305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8770774095.

The product of its (nonzero) digits is 8100, while the sum is 33.

Adding to 131561611305 its reverse (503116165131), we get a palindrome (634677776436).

The spelling of 131561611305 in words is "one hundred thirty-one billion, five hundred sixty-one million, six hundred eleven thousand, three hundred five".