5181979221 has 12 divisors (see below), whose sum is σ = 7486659648. Its totient is φ = 3453924264.

The previous prime is 5181979181. The next prime is 5181979237. The reversal of 5181979221 is 1229791815.

It is not a de Polignac number, because 5181979221 - 2⁶ = 5181979157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5181979261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13755 + ... + 102728.

It is an arithmetic number, because the mean of its divisors is an integer number (623888304).

Almost surely, 2^5181979221 is an apocalyptic number.

It is an amenable number.

5181979221 is a deficient number, since it is larger than the sum of its proper divisors (2304680427).

5181979221 is a wasteful number, since it uses less digits than its factorization.

5181979221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121432 (or 121429 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The square root of 5181979221 is about 71985.9654446615. The cubic root of 5181979221 is about 1730.4745733794.

The spelling of 5181979221 in words is "five billion, one hundred eighty-one million, nine hundred seventy-nine thousand, two hundred twenty-one".