3552781 has 2 divisors, whose sum is σ = 3552782. Its totient is φ = 3552780.

The previous prime is 3552751. The next prime is 3552793. The reversal of 3552781 is 1872553.

3552781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 770-th star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3363556 + 189225 = 1834^2 + 435^2 .

It is an emirp because it is prime and its reverse (1872553) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3552781 - 2¹¹ = 3550733 is a prime.

It is a super-2 number, since 2×3552781² = 25244505667922, which contains 22 as substring.

It is equal to p₂₅₃₅₈₈ and since 3552781 and 253588 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3552751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1776390 + 1776391.

It is an arithmetic number, because the mean of its divisors is an integer number (1776391).

Almost surely, 2^3552781 is an apocalyptic number.

It is an amenable number.

3552781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3552781 is an equidigital number, since it uses as much as digits as its factorization.

3552781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 3552781 is about 1884.8822244374. The cubic root of 3552781 is about 152.5888544267.

It can be divided in two parts, 355 and 2781, that added together give a square (3136 = 56²).

The spelling of 3552781 in words is "three million, five hundred fifty-two thousand, seven hundred eighty-one".