3257857261 has 4 divisors (see below), whose sum is σ = 3270837024. Its totient is φ = 3244877500.

The previous prime is 3257857157. The next prime is 3257857283. The reversal of 3257857261 is 1627587523.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3257857261 - 2¹⁹ = 3257332973 is a prime.

It is a super-2 number, since 2×3257857261² = 21227267866100844242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3257857661) 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, 6489505 + ... + 6490006.

It is an arithmetic number, because the mean of its divisors is an integer number (817709256).

Almost surely, 2^3257857261 is an apocalyptic number.

It is an amenable number.

3257857261 is a deficient number, since it is larger than the sum of its proper divisors (12979763).

3257857261 is a wasteful number, since it uses less digits than its factorization.

3257857261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12979762.

The product of its digits is 705600, while the sum is 46.

The square root of 3257857261 is about 57077.6423917456. The cubic root of 3257857261 is about 1482.4407712081.

The spelling of 3257857261 in words is "three billion, two hundred fifty-seven million, eight hundred fifty-seven thousand, two hundred sixty-one".