869860049 has 2 divisors, whose sum is σ = 869860050. Its totient is φ = 869860048.

The previous prime is 869860021. The next prime is 869860051. The reversal of 869860049 is 940068968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 710595649 + 159264400 = 26657^2 + 12620^2 .

It is a cyclic number.

It is not a de Polignac number, because 869860049 - 2¹² = 869855953 is a prime.

Together with 869860051, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 869859979 and 869860006.

It is not a weakly prime, because it can be changed into another prime (869860099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434930024 + 434930025.

It is an arithmetic number, because the mean of its divisors is an integer number (434930025).

Almost surely, 2^869860049 is an apocalyptic number.

It is an amenable number.

869860049 is a deficient number, since it is larger than the sum of its proper divisors (1).

869860049 is an equidigital number, since it uses as much as digits as its factorization.

869860049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 869860049 is about 29493.3899204551. The cubic root of 869860049 is about 954.5890793555.

The spelling of 869860049 in words is "eight hundred sixty-nine million, eight hundred sixty thousand, forty-nine".