2687951491 has 4 divisors (see below), whose sum is σ = 2688859800. Its totient is φ = 2687043184.

The previous prime is 2687951477. The next prime is 2687951509. The reversal of 2687951491 is 1941597862.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2687951491 - 2⁵ = 2687951459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2687991491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449701 + ... + 455638.

It is an arithmetic number, because the mean of its divisors is an integer number (672214950).

Almost surely, 2^2687951491 is an apocalyptic number.

2687951491 is a deficient number, since it is larger than the sum of its proper divisors (908309).

2687951491 is an equidigital number, since it uses as much as digits as its factorization.

2687951491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908308.

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

The square root of 2687951491 is about 51845.4577663270. The cubic root of 2687951491 is about 1390.4022938876.

The spelling of 2687951491 in words is "two billion, six hundred eighty-seven million, nine hundred fifty-one thousand, four hundred ninety-one".