872020901 has 4 divisors (see below), whose sum is σ = 872127852. Its totient is φ = 871913952.

The previous prime is 872020883. The next prime is 872020927. The reversal of 872020901 is 109020278.

It is a happy number.

It is a Cunningham number, because it is equal to 29530²+1.

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 118243876 + 753777025 = 10874^2 + 27455^2 .

It is a cyclic number.

It is not a de Polignac number, because 872020901 - 2¹⁴ = 872004517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872020001) 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, 40136 + ... + 57921.

It is an arithmetic number, because the mean of its divisors is an integer number (218031963).

Almost surely, 2^872020901 is an apocalyptic number.

It is an amenable number.

872020901 is a deficient number, since it is larger than the sum of its proper divisors (106951).

872020901 is an equidigital number, since it uses as much as digits as its factorization.

872020901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106950.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 872020901 is about 29530.0000169319. Note that the first 4 decimals coincide. The cubic root of 872020901 is about 955.3788692554.

The spelling of 872020901 in words is "eight hundred seventy-two million, twenty thousand, nine hundred one".