801520999 has 2 divisors, whose sum is σ = 801521000. Its totient is φ = 801520998.

The previous prime is 801520987. The next prime is 801521081. The reversal of 801520999 is 999025108.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 801520999 - 2¹¹ = 801518951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (801520099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400760499 + 400760500.

It is an arithmetic number, because the mean of its divisors is an integer number (400760500).

Almost surely, 2^801520999 is an apocalyptic number.

801520999 is a deficient number, since it is larger than the sum of its proper divisors (1).

801520999 is an equidigital number, since it uses as much as digits as its factorization.

801520999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 801520999 is about 28311.1461972136. The cubic root of 801520999 is about 928.9057152656.

The spelling of 801520999 in words is "eight hundred one million, five hundred twenty thousand, nine hundred ninety-nine".