857441261 has 4 divisors (see below), whose sum is σ = 873619452. Its totient is φ = 841263072.

The previous prime is 857441251. The next prime is 857441287. The reversal of 857441261 is 162144758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162144758 = 2 ⋅81072379.

It can be written as a sum of positive squares in 2 ways, for example, as 420004036 + 437437225 = 20494^2 + 20915^2 .

It is a cyclic number.

It is not a de Polignac number, because 857441261 - 2²² = 853246957 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 (857441251) 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 3 ways as a sum of consecutive naturals, for example, 8089016 + ... + 8089121.

It is an arithmetic number, because the mean of its divisors is an integer number (218404863).

Almost surely, 2^857441261 is an apocalyptic number.

It is an amenable number.

857441261 is a deficient number, since it is larger than the sum of its proper divisors (16178191).

857441261 is a wasteful number, since it uses less digits than its factorization.

857441261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16178190.

The product of its digits is 53760, while the sum is 38.

The square root of 857441261 is about 29282.0979610410. The cubic root of 857441261 is about 950.0244724998.

The spelling of 857441261 in words is "eight hundred fifty-seven million, four hundred forty-one thousand, two hundred sixty-one".