863780551 has 4 divisors (see below), whose sum is σ = 869501104. Its totient is φ = 858060000.

The previous prime is 863780537. The next prime is 863780587. The reversal of 863780551 is 155087368.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 863780551 - 2⁹ = 863780039 is a prime.

It is a super-2 number, since 2×863780551² = 1492233680571727202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 863780498 and 863780507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863780531) 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 3 ways as a sum of consecutive naturals, for example, 2860050 + ... + 2860351.

It is an arithmetic number, because the mean of its divisors is an integer number (217375276).

Almost surely, 2^863780551 is an apocalyptic number.

863780551 is a deficient number, since it is larger than the sum of its proper divisors (5720553).

863780551 is a wasteful number, since it uses less digits than its factorization.

863780551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5720552.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 863780551 is about 29390.1437730406. The cubic root of 863780551 is about 952.3599869516.

The spelling of 863780551 in words is "eight hundred sixty-three million, seven hundred eighty thousand, five hundred fifty-one".