32001491 has 4 divisors (see below), whose sum is σ = 33685800. Its totient is φ = 30317184.

The previous prime is 32001481. The next prime is 32001493. The reversal of 32001491 is 19410023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19410023 = 137 ⋅141679.

It is a cyclic number.

It is not a de Polignac number, because 32001491 - 2²² = 27807187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (32001493) 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, 842126 + ... + 842163.

It is an arithmetic number, because the mean of its divisors is an integer number (8421450).

Almost surely, 2^32001491 is an apocalyptic number.

32001491 is a deficient number, since it is larger than the sum of its proper divisors (1684309).

32001491 is a wasteful number, since it uses less digits than its factorization.

32001491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684308.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 32001491 is about 5656.9860349836. The cubic root of 32001491 is about 317.4851411816.

The spelling of 32001491 in words is "thirty-two million, one thousand, four hundred ninety-one".