861561357 has 8 divisors (see below), whose sum is σ = 1164928320. Its totient is φ = 566284320.

The previous prime is 861561329. The next prime is 861561361. The reversal of 861561357 is 753165168.

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

It is not a de Polignac number, because 861561357 - 2⁷ = 861561229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861561307) 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, 2022232 + ... + 2022657.

It is an arithmetic number, because the mean of its divisors is an integer number (145616040).

Almost surely, 2^861561357 is an apocalyptic number.

It is an amenable number.

861561357 is a deficient number, since it is larger than the sum of its proper divisors (303366963).

861561357 is a wasteful number, since it uses less digits than its factorization.

861561357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044963.

The product of its digits is 151200, while the sum is 42.

The square root of 861561357 is about 29352.3654413064. The cubic root of 861561357 is about 951.5436977888.

The spelling of 861561357 in words is "eight hundred sixty-one million, five hundred sixty-one thousand, three hundred fifty-seven".