801521291 has 2 divisors, whose sum is σ = 801521292. Its totient is φ = 801521290.

The previous prime is 801521263. The next prime is 801521293. The reversal of 801521291 is 192125108.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-801521291 is a prime.

Together with 801521293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (801521293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400760645 + 400760646.

It is an arithmetic number, because the mean of its divisors is an integer number (400760646).

Almost surely, 2^801521291 is an apocalyptic number.

801521291 is a deficient number, since it is larger than the sum of its proper divisors (1).

801521291 is an equidigital number, since it uses as much as digits as its factorization.

801521291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 801521291 is about 28311.1513541926. The cubic root of 801521291 is about 928.9058280679.

Adding to 801521291 its reverse (192125108), we get a palindrome (993646399).

The spelling of 801521291 in words is "eight hundred one million, five hundred twenty-one thousand, two hundred ninety-one".