801521249 has 2 divisors, whose sum is σ = 801521250. Its totient is φ = 801521248.

The previous prime is 801521233. The next prime is 801521261. The reversal of 801521249 is 942125108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 426711649 + 374809600 = 20657^2 + 19360^2 .

It is a cyclic number.

It is not a de Polignac number, because 801521249 - 2⁴ = 801521233 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (801521299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400760624 + 400760625.

It is an arithmetic number, because the mean of its divisors is an integer number (400760625).

Almost surely, 2^801521249 is an apocalyptic number.

It is an amenable number.

801521249 is a deficient number, since it is larger than the sum of its proper divisors (1).

801521249 is an equidigital number, since it uses as much as digits as its factorization.

801521249 is an odious number, because the sum of its binary digits is odd.

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

The square root of 801521249 is about 28311.1506124354. The cubic root of 801521249 is about 928.9058118429.

The spelling of 801521249 in words is "eight hundred one million, five hundred twenty-one thousand, two hundred forty-nine".