131868257 has 4 divisors (see below), whose sum is σ = 131901120. Its totient is φ = 131835396.

The previous prime is 131868241. The next prime is 131868263. The reversal of 131868257 is 752868131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752868131 = 23 ⋅32733397.

It is a cyclic number.

It is not a de Polignac number, because 131868257 - 2⁴ = 131868241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131868287) 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, 9413 + ... + 18770.

It is an arithmetic number, because the mean of its divisors is an integer number (32975280).

Almost surely, 2^131868257 is an apocalyptic number.

It is an amenable number.

131868257 is a deficient number, since it is larger than the sum of its proper divisors (32863).

131868257 is an equidigital number, since it uses as much as digits as its factorization.

131868257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32862.

The product of its digits is 80640, while the sum is 41.

The square root of 131868257 is about 11483.3904836507. The cubic root of 131868257 is about 508.9948895778.

The spelling of 131868257 in words is "one hundred thirty-one million, eight hundred sixty-eight thousand, two hundred fifty-seven".