7001681 has 2 divisors, whose sum is σ = 7001682. Its totient is φ = 7001680.

The previous prime is 7001669. The next prime is 7001689. The reversal of 7001681 is 1861007.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3671056 + 3330625 = 1916^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 7001681 - 2¹⁰ = 7000657 is a prime.

It is a super-2 number, since 2×7001681² = 98047073651522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7001689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3500840 + 3500841.

It is an arithmetic number, because the mean of its divisors is an integer number (3500841).

Almost surely, 2^7001681 is an apocalyptic number.

It is an amenable number.

7001681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7001681 is an equidigital number, since it uses as much as digits as its factorization.

7001681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 7001681 is about 2646.0689711344. The cubic root of 7001681 is about 191.3084296103.

Adding to 7001681 its reverse (1861007), we get a palindrome (8862688).

The spelling of 7001681 in words is "seven million, one thousand, six hundred eighty-one".