131381805 has 8 divisors (see below), whose sum is σ = 210210912. Its totient is φ = 70070288.

The previous prime is 131381801. The next prime is 131381807. The reversal of 131381805 is 508183131.

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 131381805 - 2² = 131381801 is a prime.

It is a super-2 number, since 2×131381805² = 34522357370116050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131381801) 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, 4379379 + ... + 4379408.

It is an arithmetic number, because the mean of its divisors is an integer number (26276364).

Almost surely, 2^131381805 is an apocalyptic number.

131381805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131381805 is a deficient number, since it is larger than the sum of its proper divisors (78829107).

131381805 is an equidigital number, since it uses as much as digits as its factorization.

131381805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8758795.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 131381805 is about 11462.1902357272. The cubic root of 131381805 is about 508.3682372044.

The spelling of 131381805 in words is "one hundred thirty-one million, three hundred eighty-one thousand, eight hundred five".