861306883251 has 8 divisors (see below), whose sum is σ = 1148421435840. Its totient is φ = 574198459752.

The previous prime is 861306883247. The next prime is 861306883253. The reversal of 861306883251 is 152388603168.

It is a happy number.

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

It is not a de Polignac number, because 861306883251 - 2² = 861306883247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861306883194 and 861306883203.

It is not an unprimeable number, because it can be changed into a prime (861306883253) 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 7 ways as a sum of consecutive naturals, for example, 1193685 + ... + 1774118.

It is an arithmetic number, because the mean of its divisors is an integer number (143552679480).

Almost surely, 2^861306883251 is an apocalyptic number.

861306883251 is a deficient number, since it is larger than the sum of its proper divisors (287114552589).

861306883251 is a wasteful number, since it uses less digits than its factorization.

861306883251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064545.

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 861306883251 in words is "eight hundred sixty-one billion, three hundred six million, eight hundred eighty-three thousand, two hundred fifty-one".