131278167621 has 12 divisors (see below), whose sum is σ = 189741165120. Its totient is φ = 87464711400.

The previous prime is 131278167577. The next prime is 131278167677. The reversal of 131278167621 is 126761872131.

131278167621 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 7 + 8 + 16 + 7 + 621 = 666.

It is not a de Polignac number, because 131278167621 - 2⁶ = 131278167557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131278162621) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 4490205 + ... + 4519346.

It is an arithmetic number, because the mean of its divisors is an integer number (15811763760).

Almost surely, 2^131278167621 is an apocalyptic number.

It is an amenable number.

131278167621 is a deficient number, since it is larger than the sum of its proper divisors (58462997499).

131278167621 is a wasteful number, since it uses less digits than its factorization.

131278167621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9011176 (or 9011173 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The spelling of 131278167621 in words is "one hundred thirty-one billion, two hundred seventy-eight million, one hundred sixty-seven thousand, six hundred twenty-one".