131840857 has 2 divisors, whose sum is σ = 131840858. Its totient is φ = 131840856.

The previous prime is 131840833. The next prime is 131840903. The reversal of 131840857 is 758048131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130622041 + 1218816 = 11429^2 + 1104^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131840857 is a prime.

It is not a weakly prime, because it can be changed into another prime (131840257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65920428 + 65920429.

It is an arithmetic number, because the mean of its divisors is an integer number (65920429).

Almost surely, 2^131840857 is an apocalyptic number.

It is an amenable number.

131840857 is a deficient number, since it is larger than the sum of its proper divisors (1).

131840857 is an equidigital number, since it uses as much as digits as its factorization.

131840857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 131840857 is about 11482.1973942273. The cubic root of 131840857 is about 508.9596336177.

Adding to 131840857 its reverse (758048131), we get a palindrome (889888988).

The spelling of 131840857 in words is "one hundred thirty-one million, eight hundred forty thousand, eight hundred fifty-seven".