802001861 has 4 divisors (see below), whose sum is σ = 821562924. Its totient is φ = 782440800.

The previous prime is 802001857. The next prime is 802001867. The reversal of 802001861 is 168100208.

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 36372961 + 765628900 = 6031^2 + 27670^2 .

It is a cyclic number.

It is not a de Polignac number, because 802001861 - 2² = 802001857 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 802001861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (802001867) 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, 9780470 + ... + 9780551.

It is an arithmetic number, because the mean of its divisors is an integer number (205390731).

Almost surely, 2^802001861 is an apocalyptic number.

It is an amenable number.

802001861 is a deficient number, since it is larger than the sum of its proper divisors (19561063).

802001861 is a wasteful number, since it uses less digits than its factorization.

802001861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19561062.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 802001861 is about 28319.6373740908. The cubic root of 802001861 is about 929.0914397255.

The spelling of 802001861 in words is "eight hundred two million, one thousand, eight hundred sixty-one".