131405505 has 48 divisors (see below), whose sum is σ = 266825664. Its totient is φ = 54606720.

The previous prime is 131405489. The next prime is 131405513. The reversal of 131405505 is 505504131.

It is not a de Polignac number, because 131405505 - 2⁴ = 131405489 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42 + ... + 16211.

It is an arithmetic number, because the mean of its divisors is an integer number (5558868).

Almost surely, 2^131405505 is an apocalyptic number.

131405505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131405505 is an abundant number, since it is smaller than the sum of its proper divisors (135420159).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131405505 is a wasteful number, since it uses less digits than its factorization.

131405505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16286 (or 16279 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 131405505 is about 11463.2240229353. The cubic root of 131405505 is about 508.3988035953.

Adding to 131405505 its reverse (505504131), we get a palindrome (636909636).

The spelling of 131405505 in words is "one hundred thirty-one million, four hundred five thousand, five hundred five".