5131421 has 2 divisors, whose sum is σ = 5131422. Its totient is φ = 5131420.

The previous prime is 5131417. The next prime is 5131439. The reversal of 5131421 is 1241315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2839225 + 2292196 = 1685^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 5131421 - 2² = 5131417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 5131421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5131481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2565710 + 2565711.

It is an arithmetic number, because the mean of its divisors is an integer number (2565711).

Almost surely, 2^5131421 is an apocalyptic number.

It is an amenable number.

5131421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5131421 is an equidigital number, since it uses as much as digits as its factorization.

5131421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 17.

The square root of 5131421 is about 2265.2640022743. The cubic root of 5131421 is about 172.4828352311.

Adding to 5131421 its reverse (1241315), we get a palindrome (6372736).

The spelling of 5131421 in words is "five million, one hundred thirty-one thousand, four hundred twenty-one".