2991745861 has 16 divisors (see below), whose sum is σ = 3470423040. Its totient is φ = 2556322560.

The previous prime is 2991745859. The next prime is 2991745891. The reversal of 2991745861 is 1685471992.

It is a cyclic number.

It is not a de Polignac number, because 2991745861 - 2¹ = 2991745859 is a prime.

It is a super-3 number, since 3×2991745861³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2991745799 and 2991745808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991745891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152116 + ... + 170653.

It is an arithmetic number, because the mean of its divisors is an integer number (216901440).

Almost surely, 2^2991745861 is an apocalyptic number.

It is an amenable number.

2991745861 is a deficient number, since it is larger than the sum of its proper divisors (478677179).

2991745861 is a wasteful number, since it uses less digits than its factorization.

2991745861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322836.

The product of its digits is 1088640, while the sum is 52.

The square root of 2991745861 is about 54696.8542148449. The cubic root of 2991745861 is about 1440.9256299625.

The spelling of 2991745861 in words is "two billion, nine hundred ninety-one million, seven hundred forty-five thousand, eight hundred sixty-one".