861057131 has 8 divisors (see below), whose sum is σ = 939662400. Its totient is φ = 782506440.

The previous prime is 861057121. The next prime is 861057137. The reversal of 861057131 is 131750168.

861057131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861057131 - 2²² = 856862827 is a prime.

It is a super-3 number, since 3×861057131³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861057137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23840 + ... + 47858.

It is an arithmetic number, because the mean of its divisors is an integer number (117457800).

Almost surely, 2^861057131 is an apocalyptic number.

861057131 is a deficient number, since it is larger than the sum of its proper divisors (78605269).

861057131 is a wasteful number, since it uses less digits than its factorization.

861057131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27289.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 861057131 is about 29343.7749957295. The cubic root of 861057131 is about 951.3580322727.

The spelling of 861057131 in words is "eight hundred sixty-one million, fifty-seven thousand, one hundred thirty-one".