995777821 has 4 divisors (see below), whose sum is σ = 1048187200. Its totient is φ = 943368444.

The previous prime is 995777813. The next prime is 995777851. The reversal of 995777821 is 128777599.

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 995777821 - 2³ = 995777813 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 (995777851) 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, 26204661 + ... + 26204698.

It is an arithmetic number, because the mean of its divisors is an integer number (262046800).

Almost surely, 2^995777821 is an apocalyptic number.

It is an amenable number.

995777821 is a deficient number, since it is larger than the sum of its proper divisors (52409379).

995777821 is a wasteful number, since it uses less digits than its factorization.

995777821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52409378.

The product of its digits is 2222640, while the sum is 55.

The square root of 995777821 is about 31555.9474742876. The cubic root of 995777821 is about 998.5906215857.

It can be divided in two parts, 9957 and 77821, that added together give a palindrome (87778).

The spelling of 995777821 in words is "nine hundred ninety-five million, seven hundred seventy-seven thousand, eight hundred twenty-one".