864790263481 has 3 divisors (see below), whose sum is σ = 864791193423. Its totient is φ = 864789333540.

The previous prime is 864790263439. The next prime is 864790263521. The reversal of 864790263481 is 184362097468.

It is a happy number.

The square root of 864790263481 is 929941.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 283139987881 + 581650275600 = 532109^2 + 762660^2 .

It is not a de Polignac number, because 864790263481 - 2⁷ = 864790263353 is a prime.

It is a super-2 number, since 2×864790263481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864790263401) 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 2 ways as a sum of consecutive naturals, for example, 464971 + ... + 1394911.

It is an arithmetic number, because the mean of its divisors is an integer number (288263731141).

Almost surely, 2^864790263481 is an apocalyptic number.

864790263481 is the 929941-st square number.

864790263481 is the 464971-st centered octagonal number.

It is an amenable number.

864790263481 is a deficient number, since it is larger than the sum of its proper divisors (929942).

864790263481 is an frugal number, since it uses more digits than its factorization.

864790263481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859882 (or 929941 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 58.

The spelling of 864790263481 in words is "eight hundred sixty-four billion, seven hundred ninety million, two hundred sixty-three thousand, four hundred eighty-one".