2491821087 has 16 divisors (see below), whose sum is σ = 4020417792. Its totient is φ = 1340138880.

The previous prime is 2491821077. The next prime is 2491821097. The reversal of 2491821087 is 7801281942.

It is an interprime number because it is at equal distance from previous prime (2491821077) and next prime (2491821097).

It is not a de Polignac number, because 2491821087 - 2⁴ = 2491821071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491821077) 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, 3489589 + ... + 3490302.

It is an arithmetic number, because the mean of its divisors is an integer number (251276112).

Almost surely, 2^2491821087 is an apocalyptic number.

2491821087 is a deficient number, since it is larger than the sum of its proper divisors (1528596705).

2491821087 is a wasteful number, since it uses less digits than its factorization.

2491821087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6979918.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 2491821087 is about 49918.1438657328. The cubic root of 2491821087 is about 1355.7271256115.

The spelling of 2491821087 in words is "two billion, four hundred ninety-one million, eight hundred twenty-one thousand, eighty-seven".