2491616985 has 64 divisors (see below), whose sum is σ = 4959118080. Its totient is φ = 1049518080.

The previous prime is 2491616977. The next prime is 2491616993. The reversal of 2491616985 is 5896161942.

It is an interprime number because it is at equal distance from previous prime (2491616977) and next prime (2491616993).

It is not a de Polignac number, because 2491616985 - 2³ = 2491616977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2301 + ... + 70629.

It is an arithmetic number, because the mean of its divisors is an integer number (77486220).

Almost surely, 2^2491616985 is an apocalyptic number.

It is an amenable number.

2491616985 is a deficient number, since it is larger than the sum of its proper divisors (2467501095).

2491616985 is a wasteful number, since it uses less digits than its factorization.

2491616985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68378.

The product of its digits is 933120, while the sum is 51.

The square root of 2491616985 is about 49916.0994569888. The cubic root of 2491616985 is about 1355.6901092871.

The spelling of 2491616985 in words is "two billion, four hundred ninety-one million, six hundred sixteen thousand, nine hundred eighty-five".