131771523778 has 8 divisors (see below), whose sum is σ = 206251080768. Its totient is φ = 63021163524.

The previous prime is 131771523773. The next prime is 131771523799. The reversal of 131771523778 is 877325177131.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (131771523773) 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 3 ways as a sum of consecutive naturals, for example, 1432299126 + ... + 1432299217.

It is an arithmetic number, because the mean of its divisors is an integer number (25781385096).

Almost surely, 2^131771523778 is an apocalyptic number.

131771523778 is a deficient number, since it is larger than the sum of its proper divisors (74479556990).

131771523778 is a wasteful number, since it uses less digits than its factorization.

131771523778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864598368.

The product of its digits is 1728720, while the sum is 52.

The spelling of 131771523778 in words is "one hundred thirty-one billion, seven hundred seventy-one million, five hundred twenty-three thousand, seven hundred seventy-eight".