5431021 has 2 divisors, whose sum is σ = 5431022. Its totient is φ = 5431020.

The previous prime is 5430961. The next prime is 5431037. The reversal of 5431021 is 1201345.

It is an a-pointer prime, because the next prime (5431037) can be obtained adding 5431021 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3062500 + 2368521 = 1750^2 + 1539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5431021 is a prime.

5431021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 5430986 and 5431004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5431121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2715510 + 2715511.

It is an arithmetic number, because the mean of its divisors is an integer number (2715511).

Almost surely, 2^5431021 is an apocalyptic number.

It is an amenable number.

5431021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5431021 is an equidigital number, since it uses as much as digits as its factorization.

5431021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 5431021 is about 2330.4551057680. The cubic root of 5431021 is about 175.7763710178.

Adding to 5431021 its reverse (1201345), we get a palindrome (6632366).

The spelling of 5431021 in words is "five million, four hundred thirty-one thousand, twenty-one".