3625781 has 2 divisors, whose sum is σ = 3625782. Its totient is φ = 3625780.

The previous prime is 3625759. The next prime is 3625793. The reversal of 3625781 is 1875263.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3496900 + 128881 = 1870^2 + 359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3625781 is a prime.

It is a super-2 number, since 2×3625781² = 26292575719922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3625711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1812890 + 1812891.

It is an arithmetic number, because the mean of its divisors is an integer number (1812891).

Almost surely, 2^3625781 is an apocalyptic number.

It is an amenable number.

3625781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3625781 is an equidigital number, since it uses as much as digits as its factorization.

3625781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 3625781 is about 1904.1483660681. The cubic root of 3625781 is about 153.6268725815.

The spelling of 3625781 in words is "three million, six hundred twenty-five thousand, seven hundred eighty-one".