2591951 has 4 divisors (see below), whose sum is σ = 2634504. Its totient is φ = 2549400.

The previous prime is 2591921. The next prime is 2591969. The reversal of 2591951 is 1591952.

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 2591951 - 2¹⁸ = 2329807 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2591921) 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 3 ways as a sum of consecutive naturals, for example, 21185 + ... + 21306.

It is an arithmetic number, because the mean of its divisors is an integer number (658626).

2^2591951 is an apocalyptic number.

2591951 is a deficient number, since it is larger than the sum of its proper divisors (42553).

2591951 is an equidigital number, since it uses as much as digits as its factorization.

2591951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42552.

The product of its digits is 4050, while the sum is 32.

The square root of 2591951 is about 1609.9537260431. The cubic root of 2591951 is about 137.3648434991.

Subtracting from 2591951 its reverse (1591952), we obtain a palindrome (999999).

The spelling of 2591951 in words is "two million, five hundred ninety-one thousand, nine hundred fifty-one".