2591831 has 4 divisors (see below), whose sum is σ = 2827464. Its totient is φ = 2356200.

The previous prime is 2591821. The next prime is 2591839. The reversal of 2591831 is 1381952.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2591831 - 2⁶ = 2591767 is a prime.

It is a super-2 number, since 2×2591831² = 13435175865122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2591794 and 2591803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2591839) 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, 117800 + ... + 117821.

It is an arithmetic number, because the mean of its divisors is an integer number (706866).

2^2591831 is an apocalyptic number.

2591831 is a deficient number, since it is larger than the sum of its proper divisors (235633).

2591831 is a wasteful number, since it uses less digits than its factorization.

2591831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235632.

The product of its digits is 2160, while the sum is 29.

The square root of 2591831 is about 1609.9164574598. The cubic root of 2591831 is about 137.3627235985.

The spelling of 2591831 in words is "two million, five hundred ninety-one thousand, eight hundred thirty-one".