850241921 has 2 divisors, whose sum is σ = 850241922. Its totient is φ = 850241920.

The previous prime is 850241837. The next prime is 850241933. The reversal of 850241921 is 129142058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 682254400 + 167987521 = 26120^2 + 12961^2 .

It is a cyclic number.

It is not a de Polignac number, because 850241921 - 2¹⁸ = 849979777 is a prime.

It is a super-2 number, since 2×850241921² = 1445822648451540482, which contains 22 as substring.

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 (850241941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425120960 + 425120961.

It is an arithmetic number, because the mean of its divisors is an integer number (425120961).

Almost surely, 2^850241921 is an apocalyptic number.

It is an amenable number.

850241921 is a deficient number, since it is larger than the sum of its proper divisors (1).

850241921 is an equidigital number, since it uses as much as digits as its factorization.

850241921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 850241921 is about 29158.9080899817. The cubic root of 850241921 is about 947.3580969277.

Adding to 850241921 its reverse (129142058), we get a palindrome (979383979).

The spelling of 850241921 in words is "eight hundred fifty million, two hundred forty-one thousand, nine hundred twenty-one".