2491696987 has 16 divisors (see below), whose sum is σ = 2847543552. Its totient is φ = 2159907840.

The previous prime is 2491696913. The next prime is 2491697041. The reversal of 2491696987 is 7896961942.

It is a cyclic number.

It is not a de Polignac number, because 2491696987 - 2³¹ = 344213339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2491696087) 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, 88662 + ... + 113332.

It is an arithmetic number, because the mean of its divisors is an integer number (177971472).

Almost surely, 2^2491696987 is an apocalyptic number.

2491696987 is a deficient number, since it is larger than the sum of its proper divisors (355846565).

2491696987 is a wasteful number, since it uses less digits than its factorization.

2491696987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25158.

The product of its digits is 11757312, while the sum is 61.

The square root of 2491696987 is about 49916.9008152549. The cubic root of 2491696987 is about 1355.7046188419.

The spelling of 2491696987 in words is "two billion, four hundred ninety-one million, six hundred ninety-six thousand, nine hundred eighty-seven".