3551391 has 16 divisors (see below), whose sum is σ = 5432320. Its totient is φ = 2290680.

The previous prime is 3551389. The next prime is 3551411. The reversal of 3551391 is 1931553.

It is not a de Polignac number, because 3551391 - 2¹ = 3551389 is a prime.

It is a super-2 number, since 2×3551391² = 25224756069762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3551291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1285 + ... + 2958.

It is an arithmetic number, because the mean of its divisors is an integer number (339520).

Almost surely, 2^3551391 is an apocalyptic number.

3551391 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3551391 is a deficient number, since it is larger than the sum of its proper divisors (1880929).

3551391 is a wasteful number, since it uses less digits than its factorization.

3551391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4283 (or 4277 counting only the distinct ones).

The product of its digits is 2025, while the sum is 27.

The square root of 3551391 is about 1884.5134650620. The cubic root of 3551391 is about 152.5689520672.

The spelling of 3551391 in words is "three million, five hundred fifty-one thousand, three hundred ninety-one".