3251681 has 2 divisors, whose sum is σ = 3251682. Its totient is φ = 3251680.

The previous prime is 3251663. The next prime is 3251693. The reversal of 3251681 is 1861523.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2739025 + 512656 = 1655^2 + 716^2 .

It is a cyclic number.

It is not a de Polignac number, because 3251681 - 2¹⁰ = 3250657 is a prime.

It is a super-2 number, since 2×3251681² = 21146858651522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3251681.

It is not a weakly prime, because it can be changed into another prime (3256681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1625840 + 1625841.

It is an arithmetic number, because the mean of its divisors is an integer number (1625841).

Almost surely, 2^3251681 is an apocalyptic number.

It is an amenable number.

3251681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3251681 is an equidigital number, since it uses as much as digits as its factorization.

3251681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 3251681 is about 1803.2418029760. The cubic root of 3251681 is about 148.1503372539.

The spelling of 3251681 in words is "three million, two hundred fifty-one thousand, six hundred eighty-one".