2985916781 has 8 divisors (see below), whose sum is σ = 3058698240. Its totient is φ = 2913874528.

The previous prime is 2985916777. The next prime is 2985916789. The reversal of 2985916781 is 1876195892.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2985916781 - 2² = 2985916777 is a prime.

It is a super-2 number, since 2×2985916781² = 17831398046114803922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2985916789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176621 + ... + 192786.

It is an arithmetic number, because the mean of its divisors is an integer number (382337280).

Almost surely, 2^2985916781 is an apocalyptic number.

It is an amenable number.

2985916781 is a deficient number, since it is larger than the sum of its proper divisors (72781459).

2985916781 is a wasteful number, since it uses less digits than its factorization.

2985916781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369603.

The product of its digits is 2177280, while the sum is 56.

The square root of 2985916781 is about 54643.5429030732. The cubic root of 2985916781 is about 1439.9891943955.

The spelling of 2985916781 in words is "two billion, nine hundred eighty-five million, nine hundred sixteen thousand, seven hundred eighty-one".