1042685681 has 2 divisors, whose sum is σ = 1042685682. Its totient is φ = 1042685680.

The previous prime is 1042685671. The next prime is 1042685729. The reversal of 1042685681 is 1865862401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1042256656 + 429025 = 32284^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042685681 - 2¹⁴ = 1042669297 is a prime.

It is a super-2 number, since 2×1042685681² = 2174386858724867522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1042685671) 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, 521342840 + 521342841.

It is an arithmetic number, because the mean of its divisors is an integer number (521342841).

Almost surely, 2^1042685681 is an apocalyptic number.

It is an amenable number.

1042685681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042685681 is an equidigital number, since it uses as much as digits as its factorization.

1042685681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 1042685681 is about 32290.6438616513. The cubic root of 1042685681 is about 1014.0307769201.

The spelling of 1042685681 in words is "one billion, forty-two million, six hundred eighty-five thousand, six hundred eighty-one".