3205131491 has 4 divisors (see below), whose sum is σ = 3221401392. Its totient is φ = 3188861592.

The previous prime is 3205131481. The next prime is 3205131539. The reversal of 3205131491 is 1941315023.

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 3205131491 - 2⁶ = 3205131427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3205131481) 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, 8134655 + ... + 8135048.

It is an arithmetic number, because the mean of its divisors is an integer number (805350348).

Almost surely, 2^3205131491 is an apocalyptic number.

3205131491 is a deficient number, since it is larger than the sum of its proper divisors (16269901).

3205131491 is a wasteful number, since it uses less digits than its factorization.

3205131491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16269900.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 3205131491 is about 56613.8807272563. The cubic root of 3205131491 is about 1474.3998693896.

The spelling of 3205131491 in words is "three billion, two hundred five million, one hundred thirty-one thousand, four hundred ninety-one".