2805216031 has 4 divisors (see below), whose sum is σ = 2952859000. Its totient is φ = 2657573064.

The previous prime is 2805216017. The next prime is 2805216059. The reversal of 2805216031 is 1306125082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1306125082 = 2 ⋅653062541.

It is a cyclic number.

It is not a de Polignac number, because 2805216031 - 2⁹ = 2805215519 is a prime.

It is a super-2 number, since 2×2805216031² = 15738473961158785922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805216331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73821456 + ... + 73821493.

It is an arithmetic number, because the mean of its divisors is an integer number (738214750).

Almost surely, 2^2805216031 is an apocalyptic number.

2805216031 is a deficient number, since it is larger than the sum of its proper divisors (147642969).

2805216031 is a wasteful number, since it uses less digits than its factorization.

2805216031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147642968.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2805216031 is about 52964.2901491184. The cubic root of 2805216031 is about 1410.3344160931.

The spelling of 2805216031 in words is "two billion, eight hundred five million, two hundred sixteen thousand, thirty-one".