3551591 has 4 divisors (see below), whose sum is σ = 3706032. Its totient is φ = 3397152.

The previous prime is 3551573. The next prime is 3551599. The reversal of 3551591 is 1951553.

It is a happy number.

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 3551591 - 2¹⁰ = 3550567 is a prime.

It is a super-2 number, since 2×3551591² = 25227597262562, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3551599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77186 + ... + 77231.

It is an arithmetic number, because the mean of its divisors is an integer number (926508).

Almost surely, 2^3551591 is an apocalyptic number.

3551591 is a deficient number, since it is larger than the sum of its proper divisors (154441).

3551591 is a wasteful number, since it uses less digits than its factorization.

3551591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154440.

The product of its digits is 3375, while the sum is 29.

The square root of 3551591 is about 1884.5665284091. The cubic root of 3551591 is about 152.5718160359.

The spelling of 3551591 in words is "three million, five hundred fifty-one thousand, five hundred ninety-one".