36591391 has 4 divisors (see below), whose sum is σ = 36953784. Its totient is φ = 36229000.

The previous prime is 36591389. The next prime is 36591419. The reversal of 36591391 is 19319563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19319563 = 23 ⋅839981.

It is a cyclic number.

It is not a de Polignac number, because 36591391 - 2¹ = 36591389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 36591391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36591491) 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, 181045 + ... + 181246.

It is an arithmetic number, because the mean of its divisors is an integer number (9238446).

Almost surely, 2^36591391 is an apocalyptic number.

36591391 is a deficient number, since it is larger than the sum of its proper divisors (362393).

36591391 is a wasteful number, since it uses less digits than its factorization.

36591391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362392.

The product of its digits is 21870, while the sum is 37.

The square root of 36591391 is about 6049.0818311542. The cubic root of 36591391 is about 331.9909968769.

It can be divided in two parts, 3659 and 1391, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 36591391 in words is "thirty-six million, five hundred ninety-one thousand, three hundred ninety-one".