869247229 has 2 divisors, whose sum is σ = 869247230. Its totient is φ = 869247228.

The previous prime is 869247227. The next prime is 869247233. The reversal of 869247229 is 922742968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 778521604 + 90725625 = 27902^2 + 9525^2 .

It is a cyclic number.

It is not a de Polignac number, because 869247229 - 2¹ = 869247227 is a prime.

Together with 869247227, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869247221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434623614 + 434623615.

It is an arithmetic number, because the mean of its divisors is an integer number (434623615).

Almost surely, 2^869247229 is an apocalyptic number.

It is an amenable number.

869247229 is a deficient number, since it is larger than the sum of its proper divisors (1).

869247229 is an equidigital number, since it uses as much as digits as its factorization.

869247229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The square root of 869247229 is about 29482.9989824645. The cubic root of 869247229 is about 954.3648560411.

The spelling of 869247229 in words is "eight hundred sixty-nine million, two hundred forty-seven thousand, two hundred twenty-nine".