2601591 has 8 divisors (see below), whose sum is σ = 3542784. Its totient is φ = 1697400.

The previous prime is 2601583. The next prime is 2601601. The reversal of 2601591 is 1951062.

Added to its reverse (1951062) it gives a triangular number (4552653 = T₃₀₁₇).

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

It is not a de Polignac number, because 2601591 - 2³ = 2601583 is a prime.

It is an Ulam number.

2601591 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2601091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9085 + ... + 9366.

It is an arithmetic number, because the mean of its divisors is an integer number (442848).

2^2601591 is an apocalyptic number.

2601591 is a deficient number, since it is larger than the sum of its proper divisors (941193).

2601591 is a wasteful number, since it uses less digits than its factorization.

2601591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18501.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 2601591 is about 1612.9448223668. The cubic root of 2601591 is about 137.5349288674.

Adding to 2601591 its reverse (1951062), we get a triangular number (4552653 = T₃₀₁₇).

It can be divided in two parts, 26015 and 91, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 2601591 in words is "two million, six hundred one thousand, five hundred ninety-one".