3261290391 has 8 divisors (see below), whose sum is σ = 4831541360. Its totient is φ = 2174193576.

The previous prime is 3261290341. The next prime is 3261290423. The reversal of 3261290391 is 1930921623.

It is a happy number.

3261290391 is a `hidden beast` number, since 3 + 2 + 612 + 9 + 0 + 39 + 1 = 666.

It is not a de Polignac number, because 3261290391 - 2⁶ = 3261290327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3261290311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60394240 + ... + 60394293.

It is an arithmetic number, because the mean of its divisors is an integer number (603942670).

Almost surely, 2^3261290391 is an apocalyptic number.

3261290391 is a deficient number, since it is larger than the sum of its proper divisors (1570250969).

3261290391 is a wasteful number, since it uses less digits than its factorization.

3261290391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120788542 (or 120788536 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 3261290391 is about 57107.7086828039. The cubic root of 3261290391 is about 1482.9613204304.

The spelling of 3261290391 in words is "three billion, two hundred sixty-one million, two hundred ninety thousand, three hundred ninety-one".