4891957817 has 4 divisors (see below), whose sum is σ = 4892211456. Its totient is φ = 4891704180.

The previous prime is 4891957813. The next prime is 4891957841. The reversal of 4891957817 is 7187591984.

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 4891957817 - 2² = 4891957813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4891957813) 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, 95273 + ... + 137334.

It is an arithmetic number, because the mean of its divisors is an integer number (1223052864).

Almost surely, 2^4891957817 is an apocalyptic number.

It is an amenable number.

4891957817 is a deficient number, since it is larger than the sum of its proper divisors (253639).

4891957817 is a wasteful number, since it uses less digits than its factorization.

4891957817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253638.

The product of its digits is 5080320, while the sum is 59.

The square root of 4891957817 is about 69942.5322461233. The cubic root of 4891957817 is about 1697.5695160752.

The spelling of 4891957817 in words is "four billion, eight hundred ninety-one million, nine hundred fifty-seven thousand, eight hundred seventeen".