131646401 has 2 divisors, whose sum is σ = 131646402. Its totient is φ = 131646400.

The previous prime is 131646373. The next prime is 131646433. The reversal of 131646401 is 104646131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118287376 + 13359025 = 10876^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 131646401 - 2¹⁰ = 131645377 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131646101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65823200 + 65823201.

It is an arithmetic number, because the mean of its divisors is an integer number (65823201).

Almost surely, 2^131646401 is an apocalyptic number.

It is an amenable number.

131646401 is a deficient number, since it is larger than the sum of its proper divisors (1).

131646401 is an equidigital number, since it uses as much as digits as its factorization.

131646401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 131646401 is about 11473.7265524327. The cubic root of 131646401 is about 508.7092839291.

The spelling of 131646401 in words is "one hundred thirty-one million, six hundred forty-six thousand, four hundred one".