5091591 has 4 divisors (see below), whose sum is σ = 6788792. Its totient is φ = 3394392.

The previous prime is 5091589. The next prime is 5091613. The reversal of 5091591 is 1951905.

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

It is not a de Polignac number, because 5091591 - 2¹ = 5091589 is a prime.

It is a super-2 number, since 2×5091591² = 51848597822562, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5091521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 848596 + ... + 848601.

It is an arithmetic number, because the mean of its divisors is an integer number (1697198).

Almost surely, 2^5091591 is an apocalyptic number.

5091591 is a deficient number, since it is larger than the sum of its proper divisors (1697201).

5091591 is a wasteful number, since it uses less digits than its factorization.

5091591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697200.

The product of its (nonzero) digits is 2025, while the sum is 30.

The square root of 5091591 is about 2256.4554061625. The cubic root of 5091591 is about 172.0354059977.

The spelling of 5091591 in words is "five million, ninety-one thousand, five hundred ninety-one".