131302605 has 24 divisors (see below), whose sum is σ = 244384992. Its totient is φ = 60023712.

The previous prime is 131302583. The next prime is 131302637. The reversal of 131302605 is 506203131.

It is not a de Polignac number, because 131302605 - 2⁵ = 131302573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88587 + ... + 90056.

It is an arithmetic number, because the mean of its divisors is an integer number (10182708).

Almost surely, 2^131302605 is an apocalyptic number.

131302605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131302605 is a deficient number, since it is larger than the sum of its proper divisors (113082387).

131302605 is a wasteful number, since it uses less digits than its factorization.

131302605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178665 (or 178658 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 131302605 is about 11458.7348778126. The cubic root of 131302605 is about 508.2660646153.

Adding to 131302605 its reverse (506203131), we get a palindrome (637505736).

The spelling of 131302605 in words is "one hundred thirty-one million, three hundred two thousand, six hundred five".