801645121 has 4 divisors (see below), whose sum is σ = 805085892. Its totient is φ = 798204352.

The previous prime is 801645101. The next prime is 801645127. The reversal of 801645121 is 121546108.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75881521 + 725763600 = 8711^2 + 26940^2 .

It is a cyclic number.

It is not a de Polignac number, because 801645121 - 2¹⁹ = 801120833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 801645121.

It is not an unprimeable number, because it can be changed into a prime (801645127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1720036 + ... + 1720501.

It is an arithmetic number, because the mean of its divisors is an integer number (201271473).

Almost surely, 2^801645121 is an apocalyptic number.

It is an amenable number.

801645121 is a deficient number, since it is larger than the sum of its proper divisors (3440771).

801645121 is a wasteful number, since it uses less digits than its factorization.

801645121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440770.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 801645121 is about 28313.3382171725. The cubic root of 801645121 is about 928.9536623080.

The spelling of 801645121 in words is "eight hundred one million, six hundred forty-five thousand, one hundred twenty-one".