1640461 has 2 divisors, whose sum is σ = 1640462. Its totient is φ = 1640460.

The previous prime is 1640447. The next prime is 1640467.

1640461 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1010025 + 630436 = 1005^2 + 794^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1640461 - 2⁷ = 1640333 is a prime.

It is a super-2 number, since 2×1640461² = 5382224585042, which contains 22 as substring.

1640461 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820230 + 820231.

It is an arithmetic number, because the mean of its divisors is an integer number (820231).

2^1640461 is an apocalyptic number.

It is an amenable number.

1640461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640461 is an equidigital number, since it uses as much as digits as its factorization.

1640461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1640461 is about 1280.8048251002. The cubic root of 1640461 is about 117.9384194630.

The spelling of 1640461 in words is "one million, six hundred forty thousand, four hundred sixty-one".