861031427 has 8 divisors (see below), whose sum is σ = 913697280. Its totient is φ = 809634760.

The previous prime is 861031397. The next prime is 861031499. The reversal of 861031427 is 724130168.

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 861031427 - 2¹⁰ = 861030403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861031393 and 861031402.

It is not an unprimeable number, because it can be changed into a prime (861030427) 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, 315899 + ... + 318612.

It is an arithmetic number, because the mean of its divisors is an integer number (114212160).

Almost surely, 2^861031427 is an apocalyptic number.

861031427 is a deficient number, since it is larger than the sum of its proper divisors (52665853).

861031427 is a wasteful number, since it uses less digits than its factorization.

861031427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634593.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 861031427 is about 29343.3370120033. The cubic root of 861031427 is about 951.3485656340.

The spelling of 861031427 in words is "eight hundred sixty-one million, thirty-one thousand, four hundred twenty-seven".