131648905 has 4 divisors (see below), whose sum is σ = 157978692. Its totient is φ = 105319120.

The previous prime is 131648899. The next prime is 131648911. The reversal of 131648905 is 509846131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509846131 = 5701 ⋅89431.

It is an interprime number because it is at equal distance from previous prime (131648899) and next prime (131648911).

It can be written as a sum of positive squares in 2 ways, for example, as 51796809 + 79852096 = 7197^2 + 8936^2 .

It is not a de Polignac number, because 131648905 - 2¹⁷ = 131517833 is a prime.

It is a super-4 number, since 4×131648905⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13164886 + ... + 13164895.

It is an arithmetic number, because the mean of its divisors is an integer number (39494673).

Almost surely, 2^131648905 is an apocalyptic number.

It is an amenable number.

131648905 is a deficient number, since it is larger than the sum of its proper divisors (26329787).

131648905 is an equidigital number, since it uses as much as digits as its factorization.

131648905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26329786.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 131648905 is about 11473.8356707772. The cubic root of 131648905 is about 508.7125092356.

The spelling of 131648905 in words is "one hundred thirty-one million, six hundred forty-eight thousand, nine hundred five".