131207257 has 4 divisors (see below), whose sum is σ = 134407476. Its totient is φ = 128007040.

The previous prime is 131207231. The next prime is 131207273. The reversal of 131207257 is 752702131.

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 38489616 + 92717641 = 6204^2 + 9629^2 .

It is a cyclic number.

It is not a de Polignac number, because 131207257 - 2¹¹ = 131205209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131207287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600048 + ... + 1600129.

It is an arithmetic number, because the mean of its divisors is an integer number (33601869).

Almost surely, 2^131207257 is an apocalyptic number.

It is an amenable number.

131207257 is a deficient number, since it is larger than the sum of its proper divisors (3200219).

131207257 is an equidigital number, since it uses as much as digits as its factorization.

131207257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3200218.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 131207257 is about 11454.5736280317. The cubic root of 131207257 is about 508.1430056502.

Adding to 131207257 its reverse (752702131), we get a palindrome (883909388).

The spelling of 131207257 in words is "one hundred thirty-one million, two hundred seven thousand, two hundred fifty-seven".