13642591 has 4 divisors (see below), whose sum is σ = 13713472. Its totient is φ = 13571712.

The previous prime is 13642561. The next prime is 13642609. The reversal of 13642591 is 19524631.

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 13642591 - 2¹³ = 13634399 is a prime.

It is a super-2 number, since 2×13642591² = 372240578386562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13642501) 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, 35151 + ... + 35536.

It is an arithmetic number, because the mean of its divisors is an integer number (3428368).

Almost surely, 2^13642591 is an apocalyptic number.

13642591 is a deficient number, since it is larger than the sum of its proper divisors (70881).

13642591 is an equidigital number, since it uses as much as digits as its factorization.

13642591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70880.

The product of its digits is 6480, while the sum is 31.

The square root of 13642591 is about 3693.5878221588. The cubic root of 13642591 is about 238.9455534431.

The spelling of 13642591 in words is "thirteen million, six hundred forty-two thousand, five hundred ninety-one".