4991257087 has 8 divisors (see below), whose sum is σ = 5048461440. Its totient is φ = 4934205600.

The previous prime is 4991257039. The next prime is 4991257111. The reversal of 4991257087 is 7807521994.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4991257087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991257027) 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, 28114 + ... + 103792.

It is an arithmetic number, because the mean of its divisors is an integer number (631057680).

Almost surely, 2^4991257087 is an apocalyptic number.

4991257087 is a deficient number, since it is larger than the sum of its proper divisors (57204353).

4991257087 is a wasteful number, since it uses less digits than its factorization.

4991257087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76433.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The square root of 4991257087 is about 70648.8293392042. The cubic root of 4991257087 is about 1708.9786871248.

The spelling of 4991257087 in words is "four billion, nine hundred ninety-one million, two hundred fifty-seven thousand, eighty-seven".