131478281 has 16 divisors (see below), whose sum is σ = 150847488. Its totient is φ = 113427600.

The previous prime is 131478251. The next prime is 131478287. The reversal of 131478281 is 182874131.

It is not a de Polignac number, because 131478281 - 2¹⁰ = 131477257 is a prime.

It is a super-2 number, since 2×131478281² = 34573076749429922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131478287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31160 + ... + 35126.

It is an arithmetic number, because the mean of its divisors is an integer number (9427968).

Almost surely, 2^131478281 is an apocalyptic number.

131478281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131478281 is a deficient number, since it is larger than the sum of its proper divisors (19369207).

131478281 is a wasteful number, since it uses less digits than its factorization.

131478281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4132.

The product of its digits is 10752, while the sum is 35.

The square root of 131478281 is about 11466.3979086721. The cubic root of 131478281 is about 508.4926413764.

The spelling of 131478281 in words is "one hundred thirty-one million, four hundred seventy-eight thousand, two hundred eighty-one".