2891015 has 4 divisors (see below), whose sum is σ = 3469224. Its totient is φ = 2312808.

The previous prime is 2891011. The next prime is 2891023. The reversal of 2891015 is 5101982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5101982 = 2 ⋅2550991.

It is a cyclic number.

It is not a de Polignac number, because 2891015 - 2² = 2891011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891011) 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, 289097 + ... + 289106.

It is an arithmetic number, because the mean of its divisors is an integer number (867306).

2^2891015 is an apocalyptic number.

2891015 is a deficient number, since it is larger than the sum of its proper divisors (578209).

2891015 is an equidigital number, since it uses as much as digits as its factorization.

2891015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578208.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 2891015 is about 1700.2985032047. The cubic root of 2891015 is about 142.4568865161.

Adding to 2891015 its reverse (5101982), we get a palindrome (7992997).

The spelling of 2891015 in words is "two million, eight hundred ninety-one thousand, fifteen".