131031478781 has 8 divisors (see below), whose sum is σ = 149877070464. Its totient is φ = 112217589360.

The previous prime is 131031478763. The next prime is 131031478793. The reversal of 131031478781 is 187874130131.

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 131031478781 - 2¹⁰ = 131031477757 is a prime.

It is a super-2 number, since 2×131031478781² (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 (131031478681) 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, 7916705 + ... + 7933238.

It is an arithmetic number, because the mean of its divisors is an integer number (18734633808).

Almost surely, 2^131031478781 is an apocalyptic number.

It is an amenable number.

131031478781 is a deficient number, since it is larger than the sum of its proper divisors (18845591683).

131031478781 is a wasteful number, since it uses less digits than its factorization.

131031478781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15851131.

The product of its (nonzero) digits is 112896, while the sum is 44.

The spelling of 131031478781 in words is "one hundred thirty-one billion, thirty-one million, four hundred seventy-eight thousand, seven hundred eighty-one".