2491715651 has 8 divisors (see below), whose sum is σ = 2638567680. Its totient is φ = 2346434568.

The previous prime is 2491715647. The next prime is 2491715683. The reversal of 2491715651 is 1565171942.

It is a happy number.

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 2491715651 - 2² = 2491715647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2491715599 and 2491715608.

It is not an unprimeable number, because it can be changed into a prime (2491715851) 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, 389471 + ... + 395816.

It is an arithmetic number, because the mean of its divisors is an integer number (329820960).

Almost surely, 2^2491715651 is an apocalyptic number.

2491715651 is a deficient number, since it is larger than the sum of its proper divisors (146852029).

2491715651 is a wasteful number, since it uses less digits than its factorization.

2491715651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785473.

The product of its digits is 75600, while the sum is 41.

The square root of 2491715651 is about 49917.0877656139. The cubic root of 2491715651 is about 1355.7080037917.

The spelling of 2491715651 in words is "two billion, four hundred ninety-one million, seven hundred fifteen thousand, six hundred fifty-one".