131311205 has 4 divisors (see below), whose sum is σ = 157573452. Its totient is φ = 105048960.

The previous prime is 131311199. The next prime is 131311241. The reversal of 131311205 is 502113131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32924644 + 98386561 = 5738^2 + 9919^2 .

It is not a de Polignac number, because 131311205 - 2¹⁶ = 131245669 is a prime.

It is a Duffinian number.

It is a congruent 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, 13131116 + ... + 13131125.

It is an arithmetic number, because the mean of its divisors is an integer number (39393363).

Almost surely, 2^131311205 is an apocalyptic number.

It is an amenable number.

131311205 is a deficient number, since it is larger than the sum of its proper divisors (26262247).

131311205 is an equidigital number, since it uses as much as digits as its factorization.

131311205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26262246.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 131311205 is about 11459.1101312449. The cubic root of 131311205 is about 508.2771611017.

Adding to 131311205 its reverse (502113131), we get a palindrome (633424336).

The spelling of 131311205 in words is "one hundred thirty-one million, three hundred eleven thousand, two hundred five".