850643449 has 2 divisors, whose sum is σ = 850643450. Its totient is φ = 850643448.

The previous prime is 850643429. The next prime is 850643461. The reversal of 850643449 is 944346058.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498405625 + 352237824 = 22325^2 + 18768^2 .

It is a cyclic number.

It is not a de Polignac number, because 850643449 - 2¹⁵ = 850610681 is a prime.

It is not a weakly prime, because it can be changed into another prime (850643429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425321724 + 425321725.

It is an arithmetic number, because the mean of its divisors is an integer number (425321725).

Almost surely, 2^850643449 is an apocalyptic number.

It is an amenable number.

850643449 is a deficient number, since it is larger than the sum of its proper divisors (1).

850643449 is an equidigital number, since it uses as much as digits as its factorization.

850643449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 850643449 is about 29165.7924459460. The cubic root of 850643449 is about 947.5072038773.

The spelling of 850643449 in words is "eight hundred fifty million, six hundred forty-three thousand, four hundred forty-nine".