131111557781 has 8 divisors (see below), whose sum is σ = 133594043904. Its totient is φ = 128629393360.

The previous prime is 131111557777. The next prime is 131111557807. The reversal of 131111557781 is 187755111131.

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

It is a cyclic number.

It is not a de Polignac number, because 131111557781 - 2² = 131111557777 is a prime.

It is a super-2 number, since 2×131111557781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131111557721) 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, 841460 + ... + 985026.

It is an arithmetic number, because the mean of its divisors is an integer number (16699255488).

Almost surely, 2^131111557781 is an apocalyptic number.

It is an amenable number.

131111557781 is a deficient number, since it is larger than the sum of its proper divisors (2482486123).

131111557781 is a wasteful number, since it uses less digits than its factorization.

131111557781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160851.

The product of its digits is 29400, while the sum is 41.

The spelling of 131111557781 in words is "one hundred thirty-one billion, one hundred eleven million, five hundred fifty-seven thousand, seven hundred eighty-one".