861052757 has 4 divisors (see below), whose sum is σ = 861375660. Its totient is φ = 860729856.

The previous prime is 861052747. The next prime is 861052793. The reversal of 861052757 is 757250168.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19704721 + 841348036 = 4439^2 + 29006^2 .

It is a cyclic number.

It is not a de Polignac number, because 861052757 - 2²⁴ = 844275541 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 (861052727) 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, 157418 + ... + 162795.

It is an arithmetic number, because the mean of its divisors is an integer number (215343915).

Almost surely, 2^861052757 is an apocalyptic number.

It is an amenable number.

861052757 is a deficient number, since it is larger than the sum of its proper divisors (322903).

861052757 is a wasteful number, since it uses less digits than its factorization.

861052757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322902.

The product of its (nonzero) digits is 117600, while the sum is 41.

The square root of 861052757 is about 29343.7004653469. The cubic root of 861052757 is about 951.3564213664.

The spelling of 861052757 in words is "eight hundred sixty-one million, fifty-two thousand, seven hundred fifty-seven".