869417729 has 2 divisors, whose sum is σ = 869417730. Its totient is φ = 869417728.

The previous prime is 869417719. The next prime is 869417741. The reversal of 869417729 is 927714968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648211600 + 221206129 = 25460^2 + 14873^2 .

It is a cyclic number.

It is not a de Polignac number, because 869417729 - 2²⁰ = 868369153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (869417719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434708864 + 434708865.

It is an arithmetic number, because the mean of its divisors is an integer number (434708865).

Almost surely, 2^869417729 is an apocalyptic number.

It is an amenable number.

869417729 is a deficient number, since it is larger than the sum of its proper divisors (1).

869417729 is an equidigital number, since it uses as much as digits as its factorization.

869417729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The square root of 869417729 is about 29485.8903375835. The cubic root of 869417729 is about 954.4272504765.

The spelling of 869417729 in words is "eight hundred sixty-nine million, four hundred seventeen thousand, seven hundred twenty-nine".