3551605 has 4 divisors (see below), whose sum is σ = 4261932. Its totient is φ = 2841280.

The previous prime is 3551599. The next prime is 3551621. The reversal of 3551605 is 5061553.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2553604 + 998001 = 1598^2 + 999^2 .

It is not a de Polignac number, because 3551605 - 2⁵ = 3551573 is a prime.

It is a super-2 number, since 2×3551605² = 25227796152050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3551605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355156 + ... + 355165.

It is an arithmetic number, because the mean of its divisors is an integer number (1065483).

Almost surely, 2^3551605 is an apocalyptic number.

It is an amenable number.

3551605 is a deficient number, since it is larger than the sum of its proper divisors (710327).

3551605 is an equidigital number, since it uses as much as digits as its factorization.

3551605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710326.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 3551605 is about 1884.5702427875. The cubic root of 3551605 is about 152.5720165097.

The spelling of 3551605 in words is "three million, five hundred fifty-one thousand, six hundred five".