861916963 has 8 divisors (see below), whose sum is σ = 894336896. Its totient is φ = 829785600.

The previous prime is 861916843. The next prime is 861916981. The reversal of 861916963 is 369619168.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861916963 is a prime.

It is a super-2 number, since 2×861916963² = 1485801702214286738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861913963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66048 + ... + 78013.

It is an arithmetic number, because the mean of its divisors is an integer number (111792112).

Almost surely, 2^861916963 is an apocalyptic number.

861916963 is a deficient number, since it is larger than the sum of its proper divisors (32419933).

861916963 is a wasteful number, since it uses less digits than its factorization.

861916963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144285.

The product of its digits is 419904, while the sum is 49.

The square root of 861916963 is about 29358.4223520270. The cubic root of 861916963 is about 951.6745950650.

The spelling of 861916963 in words is "eight hundred sixty-one million, nine hundred sixteen thousand, nine hundred sixty-three".