2991171240 has 80 divisors (see below), whose sum is σ = 10053669780. Its totient is φ = 797644800.

The previous prime is 2991171221. The next prime is 2991171241. The reversal of 2991171240 is 421711992.

It can be written as a sum of positive squares in 2 ways, for example, as 2953052964 + 38118276 = 54342^2 + 6174^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2991171195 and 2991171204.

It is not an unprimeable number, because it can be changed into a prime (2991171241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 458361 + ... + 464840.

Almost surely, 2^2991171240 is an apocalyptic number.

2991171240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2991171240 is an abundant number, since it is smaller than the sum of its proper divisors (7062498540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2991171240 is a wasteful number, since it uses less digits than its factorization.

2991171240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923224 (or 923211 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 2991171240 is about 54691.6011833627. The cubic root of 2991171240 is about 1440.8333717760.

The spelling of 2991171240 in words is "two billion, nine hundred ninety-one million, one hundred seventy-one thousand, two hundred forty".