5131320421 has 4 divisors (see below), whose sum is σ = 5131489644. Its totient is φ = 5131151200.

The previous prime is 5131320413. The next prime is 5131320433. The reversal of 5131320421 is 1240231315.

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 1948781025 + 3182539396 = 44145^2 + 56414^2 .

It is a cyclic number.

It is not a de Polignac number, because 5131320421 - 2³ = 5131320413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5131320392 and 5131320401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5131320461) 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, 25240 + ... + 104401.

It is an arithmetic number, because the mean of its divisors is an integer number (1282872411).

Almost surely, 2^5131320421 is an apocalyptic number.

It is an amenable number.

5131320421 is a deficient number, since it is larger than the sum of its proper divisors (169223).

5131320421 is a wasteful number, since it uses less digits than its factorization.

5131320421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169222.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 5131320421 is about 71633.2354497547. The cubic root of 5131320421 is about 1724.8170830058.

Adding to 5131320421 its reverse (1240231315), we get a palindrome (6371551736).

The spelling of 5131320421 in words is "five billion, one hundred thirty-one million, three hundred twenty thousand, four hundred twenty-one".