4991073257 has 4 divisors (see below), whose sum is σ = 4999938960. Its totient is φ = 4982207556.

The previous prime is 4991073247. The next prime is 4991073287. The reversal of 4991073257 is 7523701994.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4991073257 - 2²⁰ = 4990024681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4991073247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4432007 + ... + 4433132.

It is an arithmetic number, because the mean of its divisors is an integer number (1249984740).

Almost surely, 2^4991073257 is an apocalyptic number.

It is an amenable number.

4991073257 is a deficient number, since it is larger than the sum of its proper divisors (8865703).

4991073257 is an equidigital number, since it uses as much as digits as its factorization.

4991073257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8865702.

The product of its (nonzero) digits is 476280, while the sum is 47.

The square root of 4991073257 is about 70647.5283148675. The cubic root of 4991073257 is about 1708.9577060771.

The spelling of 4991073257 in words is "four billion, nine hundred ninety-one million, seventy-three thousand, two hundred fifty-seven".