801995521 has 4 divisors (see below), whose sum is σ = 802219312. Its totient is φ = 801771732.

The previous prime is 801995479. The next prime is 801995539. The reversal of 801995521 is 125599108.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 801995521 - 2²⁹ = 265124609 is a prime.

It is a super-2 number, since 2×801995521² = 1286393631408122882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (801995591) 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 in 3 ways as a sum of consecutive naturals, for example, 106431 + ... + 113716.

It is an arithmetic number, because the mean of its divisors is an integer number (200554828).

Almost surely, 2^801995521 is an apocalyptic number.

It is an amenable number.

801995521 is a deficient number, since it is larger than the sum of its proper divisors (223791).

801995521 is a wasteful number, since it uses less digits than its factorization.

801995521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223790.

The product of its (nonzero) digits is 32400, while the sum is 40.

The square root of 801995521 is about 28319.5254374080. The cubic root of 801995521 is about 929.0889914955.

The spelling of 801995521 in words is "eight hundred one million, nine hundred ninety-five thousand, five hundred twenty-one".