5197921 has 4 divisors (see below), whose sum is σ = 5211412. Its totient is φ = 5184432.

The previous prime is 5197909. The next prime is 5197943. The reversal of 5197921 is 1297915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1297915 = 5 ⋅259583.

It can be written as a sum of positive squares in 2 ways, for example, as 4157521 + 1040400 = 2039^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 5197921 - 2⁵ = 5197889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5197421) 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, 6150 + ... + 6943.

It is an arithmetic number, because the mean of its divisors is an integer number (1302853).

Almost surely, 2^5197921 is an apocalyptic number.

It is an amenable number.

5197921 is a deficient number, since it is larger than the sum of its proper divisors (13491).

5197921 is a wasteful number, since it uses less digits than its factorization.

5197921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13490.

The product of its digits is 5670, while the sum is 34.

The square root of 5197921 is about 2279.8949537205. The cubic root of 5197921 is about 173.2247293867.

The spelling of 5197921 in words is "five million, one hundred ninety-seven thousand, nine hundred twenty-one".