5191921 has 16 divisors (see below), whose sum is σ = 6323200. Its totient is φ = 4164048.

The previous prime is 5191909. The next prime is 5191931. The reversal of 5191921 is 1291915.

5191921 = T₃₉₈ + T₃₉₉ + ... + T₄₅₄.

It is not a de Polignac number, because 5191921 - 2⁷ = 5191793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5191921.

It is not an unprimeable number, because it can be changed into a prime (5191931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13510 + ... + 13888.

It is an arithmetic number, because the mean of its divisors is an integer number (395200).

Almost surely, 2^5191921 is an apocalyptic number.

It is an amenable number.

5191921 is a deficient number, since it is larger than the sum of its proper divisors (1131279).

5191921 is a wasteful number, since it uses less digits than its factorization.

5191921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508.

The product of its digits is 810, while the sum is 28.

The square root of 5191921 is about 2278.5787236784. The cubic root of 5191921 is about 173.1580521810.

The spelling of 5191921 in words is "five million, one hundred ninety-one thousand, nine hundred twenty-one".