3550391 has 4 divisors (see below), whose sum is σ = 3823512. Its totient is φ = 3277272.

The previous prime is 3550387. The next prime is 3550411. The reversal of 3550391 is 1930553.

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

It is a cyclic number.

It is not a de Polignac number, because 3550391 - 2² = 3550387 is a prime.

It is a Duffinian number.

It is a zygodrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 3550391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3550301) 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 in 3 ways as a sum of consecutive naturals, for example, 136541 + ... + 136566.

It is an arithmetic number, because the mean of its divisors is an integer number (955878).

Almost surely, 2^3550391 is an apocalyptic number.

3550391 is a deficient number, since it is larger than the sum of its proper divisors (273121).

3550391 is a wasteful number, since it uses less digits than its factorization.

3550391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273120.

The product of its (nonzero) digits is 2025, while the sum is 26.

The square root of 3550391 is about 1884.2481259112. The cubic root of 3550391 is about 152.5546306108.

The spelling of 3550391 in words is "three million, five hundred fifty thousand, three hundred ninety-one".