131534257 has 4 divisors (see below), whose sum is σ = 133012260. Its totient is φ = 130056256.

The previous prime is 131534243. The next prime is 131534269. The reversal of 131534257 is 752435131.

It is a happy number.

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 60233121 + 71301136 = 7761^2 + 8444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131534257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131534237) 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, 738868 + ... + 739045.

It is an arithmetic number, because the mean of its divisors is an integer number (33253065).

Almost surely, 2^131534257 is an apocalyptic number.

It is an amenable number.

131534257 is a deficient number, since it is larger than the sum of its proper divisors (1478003).

131534257 is an equidigital number, since it uses as much as digits as its factorization.

131534257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478002.

The product of its digits is 12600, while the sum is 31.

The square root of 131534257 is about 11468.8385200944. The cubic root of 131534257 is about 508.5647935865.

Adding to 131534257 its reverse (752435131), we get a palindrome (883969388).

The spelling of 131534257 in words is "one hundred thirty-one million, five hundred thirty-four thousand, two hundred fifty-seven".