4975621891 has 4 divisors (see below), whose sum is σ = 5091334072. Its totient is φ = 4859909712.

The previous prime is 4975621877. The next prime is 4975621913. The reversal of 4975621891 is 1981265794.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1981265794 = 2 ⋅990632897.

It is a cyclic number.

It is not a de Polignac number, because 4975621891 - 2¹⁵ = 4975589123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4975621801) 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, 57856026 + ... + 57856111.

It is an arithmetic number, because the mean of its divisors is an integer number (1272833518).

Almost surely, 2^4975621891 is an apocalyptic number.

4975621891 is a deficient number, since it is larger than the sum of its proper divisors (115712181).

4975621891 is a wasteful number, since it uses less digits than its factorization.

4975621891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115712180.

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

The square root of 4975621891 is about 70538.0882289845. The cubic root of 4975621891 is about 1707.1923525113.

The spelling of 4975621891 in words is "four billion, nine hundred seventy-five million, six hundred twenty-one thousand, eight hundred ninety-one".