2651591 has 4 divisors (see below), whose sum is σ = 2663400. Its totient is φ = 2639784.

The previous prime is 2651581. The next prime is 2651603. The reversal of 2651591 is 1951562.

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 2651591 - 2¹⁰ = 2650567 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 (2651501) 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, 5561 + ... + 6018.

It is an arithmetic number, because the mean of its divisors is an integer number (665850).

2^2651591 is an apocalyptic number.

2651591 is a deficient number, since it is larger than the sum of its proper divisors (11809).

2651591 is a wasteful number, since it uses less digits than its factorization.

2651591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11808.

The product of its digits is 2700, while the sum is 29.

The square root of 2651591 is about 1628.3706580506. The cubic root of 2651591 is about 138.4104387807.

Subtracting from 2651591 its sum of digits (29), we obtain a palindrome (2651562).

The spelling of 2651591 in words is "two million, six hundred fifty-one thousand, five hundred ninety-one".