5178144421 has 4 divisors (see below), whose sum is σ = 5178655692. Its totient is φ = 5177633152.

The previous prime is 5178144401. The next prime is 5178144449. The reversal of 5178144421 is 1244418715.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2528983521 + 2649160900 = 50289^2 + 51470^2 .

It is a cyclic number.

It is not a de Polignac number, because 5178144421 - 2²⁹ = 4641273509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5178144401) 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, 240130 + ... + 260803.

It is an arithmetic number, because the mean of its divisors is an integer number (1294663923).

Almost surely, 2^5178144421 is an apocalyptic number.

It is an amenable number.

5178144421 is a deficient number, since it is larger than the sum of its proper divisors (511271).

5178144421 is a wasteful number, since it uses less digits than its factorization.

5178144421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511270.

The product of its digits is 35840, while the sum is 37.

The square root of 5178144421 is about 71959.3247675379. The cubic root of 5178144421 is about 1730.0476025749.

The spelling of 5178144421 in words is "five billion, one hundred seventy-eight million, one hundred forty-four thousand, four hundred twenty-one".