864419261 has 2 divisors, whose sum is σ = 864419262. Its totient is φ = 864419260.

The previous prime is 864419233. The next prime is 864419267. The reversal of 864419261 is 162914468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 435515161 + 428904100 = 20869^2 + 20710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864419261 is a prime.

It is a super-2 number, since 2×864419261² = 1494441317575572242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864419267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432209630 + 432209631.

It is an arithmetic number, because the mean of its divisors is an integer number (432209631).

Almost surely, 2^864419261 is an apocalyptic number.

It is an amenable number.

864419261 is a deficient number, since it is larger than the sum of its proper divisors (1).

864419261 is an equidigital number, since it uses as much as digits as its factorization.

864419261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 41.

The square root of 864419261 is about 29401.0078228621. The cubic root of 864419261 is about 952.5946653776.

The spelling of 864419261 in words is "eight hundred sixty-four million, four hundred nineteen thousand, two hundred sixty-one".