8463505781 has 4 divisors (see below), whose sum is σ = 8464227552. Its totient is φ = 8462784012.

The previous prime is 8463505769. The next prime is 8463505793. The reversal of 8463505781 is 1875053648.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (8463505769) and next prime (8463505793).

It is a cyclic number.

It is not a de Polignac number, because 8463505781 - 2³⁰ = 7389763957 is a prime.

It is a super-2 number, since 2×8463505781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8463505741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343001 + ... + 366846.

It is an arithmetic number, because the mean of its divisors is an integer number (2116056888).

Almost surely, 2^8463505781 is an apocalyptic number.

It is an amenable number.

8463505781 is a deficient number, since it is larger than the sum of its proper divisors (721771).

8463505781 is a wasteful number, since it uses less digits than its factorization.

8463505781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721770.

The product of its (nonzero) digits is 806400, while the sum is 47.

The square root of 8463505781 is about 91997.3139879638. The cubic root of 8463505781 is about 2037.9026391147.

The spelling of 8463505781 in words is "eight billion, four hundred sixty-three million, five hundred five thousand, seven hundred eighty-one".