861368751 has 12 divisors (see below), whose sum is σ = 1246440312. Its totient is φ = 573211536.

The previous prime is 861368723. The next prime is 861368803. The reversal of 861368751 is 157863168.

It is not a de Polignac number, because 861368751 - 2⁵ = 861368719 is a prime.

It is a super-2 number, since 2×861368751² = 1483912250398600002, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 861368697 and 861368706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861368551) 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 11 ways as a sum of consecutive naturals, for example, 80901 + ... + 90926.

It is an arithmetic number, because the mean of its divisors is an integer number (103870026).

Almost surely, 2^861368751 is an apocalyptic number.

861368751 is a deficient number, since it is larger than the sum of its proper divisors (385071561).

861368751 is a wasteful number, since it uses less digits than its factorization.

861368751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172390 (or 172387 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 861368751 is about 29349.0843298390. The cubic root of 861368751 is about 951.4727851824.

The spelling of 861368751 in words is "eight hundred sixty-one million, three hundred sixty-eight thousand, seven hundred fifty-one".