4894135681 has 2 divisors, whose sum is σ = 4894135682. Its totient is φ = 4894135680.

The previous prime is 4894135657. The next prime is 4894135759. The reversal of 4894135681 is 1865314984.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3273670656 + 1620465025 = 57216^2 + 40255^2 .

It is a cyclic number.

It is not a de Polignac number, because 4894135681 - 2²⁵ = 4860581249 is a prime.

It is a super-2 number, since 2×4894135681² = 47905128128074667522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4894132681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2447067840 + 2447067841.

It is an arithmetic number, because the mean of its divisors is an integer number (2447067841).

Almost surely, 2^4894135681 is an apocalyptic number.

It is an amenable number.

4894135681 is a deficient number, since it is larger than the sum of its proper divisors (1).

4894135681 is an equidigital number, since it uses as much as digits as its factorization.

4894135681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 49.

The square root of 4894135681 is about 69958.0994667522. The cubic root of 4894135681 is about 1697.8213938968.

The spelling of 4894135681 in words is "four billion, eight hundred ninety-four million, one hundred thirty-five thousand, six hundred eighty-one".