131604457 has 2 divisors, whose sum is σ = 131604458. Its totient is φ = 131604456.

The previous prime is 131604443. The next prime is 131604481. The reversal of 131604457 is 754406131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82828201 + 48776256 = 9101^2 + 6984^2 .

It is a cyclic number.

It is not a de Polignac number, because 131604457 - 2¹⁵ = 131571689 is a prime.

It is not a weakly prime, because it can be changed into another prime (131604437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65802228 + 65802229.

It is an arithmetic number, because the mean of its divisors is an integer number (65802229).

Almost surely, 2^131604457 is an apocalyptic number.

It is an amenable number.

131604457 is a deficient number, since it is larger than the sum of its proper divisors (1).

131604457 is an equidigital number, since it uses as much as digits as its factorization.

131604457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 131604457 is about 11471.8985787009. The cubic root of 131604457 is about 508.6552513880.

It can be divided in two parts, 131604 and 457, that multiplied together give a triangular number (60143028 = T₁₀₉₆₇).

The spelling of 131604457 in words is "one hundred thirty-one million, six hundred four thousand, four hundred fifty-seven".