2891551 has 8 divisors (see below), whose sum is σ = 3127824. Its totient is φ = 2657280.

The previous prime is 2891543. The next prime is 2891569. The reversal of 2891551 is 1551982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2891551 - 2³ = 2891543 is a prime.

It is a super-2 number, since 2×2891551² = 16722134371202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891501) 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 7 ways as a sum of consecutive naturals, for example, 4191 + ... + 4831.

It is an arithmetic number, because the mean of its divisors is an integer number (390978).

2^2891551 is an apocalyptic number.

2891551 is a deficient number, since it is larger than the sum of its proper divisors (236273).

2891551 is a wasteful number, since it uses less digits than its factorization.

2891551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001.

The product of its digits is 3600, while the sum is 31.

The square root of 2891551 is about 1700.4561152820. The cubic root of 2891551 is about 142.4656899033.

The spelling of 2891551 in words is "two million, eight hundred ninety-one thousand, five hundred fifty-one".