863780531 has 2 divisors, whose sum is σ = 863780532. Its totient is φ = 863780530.

The previous prime is 863780509. The next prime is 863780537. The reversal of 863780531 is 135087368.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 863780531 - 2¹⁰ = 863779507 is a prime.

It is a super-2 number, since 2×863780531² = 1492233611469283922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (863780537) 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 as a sum of consecutive naturals, namely, 431890265 + 431890266.

It is an arithmetic number, because the mean of its divisors is an integer number (431890266).

Almost surely, 2^863780531 is an apocalyptic number.

863780531 is a deficient number, since it is larger than the sum of its proper divisors (1).

863780531 is an equidigital number, since it uses as much as digits as its factorization.

863780531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 863780531 is about 29390.1434327905. The cubic root of 863780531 is about 952.3599796013.

The spelling of 863780531 in words is "eight hundred sixty-three million, seven hundred eighty thousand, five hundred thirty-one".