864581761 has 2 divisors, whose sum is σ = 864581762. Its totient is φ = 864581760.

The previous prime is 864581749. The next prime is 864581813. The reversal of 864581761 is 167185468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 527161600 + 337420161 = 22960^2 + 18369^2 .

It is a cyclic number.

It is not a de Polignac number, because 864581761 - 2¹³ = 864573569 is a prime.

It is a super-2 number, since 2×864581761² = 1495003242907722242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (864581741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432290880 + 432290881.

It is an arithmetic number, because the mean of its divisors is an integer number (432290881).

Almost surely, 2^864581761 is an apocalyptic number.

It is an amenable number.

864581761 is a deficient number, since it is larger than the sum of its proper divisors (1).

864581761 is an equidigital number, since it uses as much as digits as its factorization.

864581761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 864581761 is about 29403.7712037079. The cubic root of 864581761 is about 952.6543535950.

The spelling of 864581761 in words is "eight hundred sixty-four million, five hundred eighty-one thousand, seven hundred sixty-one".