131321156004 has 18 divisors (see below), whose sum is σ = 331950699990. Its totient is φ = 43773718656.

The previous prime is 131321155981. The next prime is 131321156051. The reversal of 131321156004 is 400651123131.

It is a happy number.

131321156004 is a `hidden beast` number, since 1 + 31 + 3 + 21 + 1 + 5 + 600 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 131298971904 + 22184100 = 362352^2 + 4710^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1823904909 + ... + 1823904980.

It is an arithmetic number, because the mean of its divisors is an integer number (18441705555).

Almost surely, 2^131321156004 is an apocalyptic number.

It is an amenable number.

131321156004 is an abundant number, since it is smaller than the sum of its proper divisors (200629543986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131321156004 is a wasteful number, since it uses less digits than its factorization.

131321156004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647809899 (or 3647809894 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 131321156004 its reverse (400651123131), we get a palindrome (531972279135).

The spelling of 131321156004 in words is "one hundred thirty-one billion, three hundred twenty-one million, one hundred fifty-six thousand, four".