3261297491 has 4 divisors (see below), whose sum is σ = 3266670912. Its totient is φ = 3255924072.

The previous prime is 3261297463. The next prime is 3261297509. The reversal of 3261297491 is 1947921623.

3261297491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1947921623 = 1319 ⋅1476817.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3261297491 is a prime.

It is a super-2 number, since 2×3261297491² = 21272122649605790162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3261290491) 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, 2685800 + ... + 2687013.

It is an arithmetic number, because the mean of its divisors is an integer number (816667728).

Almost surely, 2^3261297491 is an apocalyptic number.

3261297491 is a deficient number, since it is larger than the sum of its proper divisors (5373421).

3261297491 is an equidigital number, since it uses as much as digits as its factorization.

3261297491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373420.

The product of its digits is 163296, while the sum is 44.

The square root of 3261297491 is about 57107.7708460066. The cubic root of 3261297491 is about 1482.9623965911.

The spelling of 3261297491 in words is "three billion, two hundred sixty-one million, two hundred ninety-seven thousand, four hundred ninety-one".