3257257261 has 4 divisors (see below), whose sum is σ = 3257386524. Its totient is φ = 3257128000.

The previous prime is 3257257249. The next prime is 3257257279. The reversal of 3257257261 is 1627527523.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1648766025 + 1608491236 = 40605^2 + 40106^2 .

It is a cyclic number.

It is not a de Polignac number, because 3257257261 - 2⁹ = 3257256749 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3257257231) 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, 13180 + ... + 81781.

It is an arithmetic number, because the mean of its divisors is an integer number (814346631).

Almost surely, 2^3257257261 is an apocalyptic number.

It is an amenable number.

3257257261 is a deficient number, since it is larger than the sum of its proper divisors (129263).

3257257261 is an equidigital number, since it uses as much as digits as its factorization.

3257257261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129262.

The product of its digits is 176400, while the sum is 40.

The square root of 3257257261 is about 57072.3861512728. The cubic root of 3257257261 is about 1482.3497585167.

The spelling of 3257257261 in words is "three billion, two hundred fifty-seven million, two hundred fifty-seven thousand, two hundred sixty-one".