6431021 has 4 divisors (see below), whose sum is σ = 6491232. Its totient is φ = 6370812.

The previous prime is 6431017. The next prime is 6431039. The reversal of 6431021 is 1201346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1201346 = 2 ⋅600673.

It is a cyclic number.

It is not a de Polignac number, because 6431021 - 2² = 6431017 is a prime.

It is a super-2 number, since 2×6431021² = 82716062204882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6431221) 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, 29945 + ... + 30158.

It is an arithmetic number, because the mean of its divisors is an integer number (1622808).

Almost surely, 2^6431021 is an apocalyptic number.

It is an amenable number.

6431021 is a deficient number, since it is larger than the sum of its proper divisors (60211).

6431021 is a wasteful number, since it uses less digits than its factorization.

6431021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60210.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 6431021 is about 2535.9457801775. The cubic root of 6431021 is about 185.9630423353.

Adding to 6431021 its reverse (1201346), we get a palindrome (7632367).

The spelling of 6431021 in words is "six million, four hundred thirty-one thousand, twenty-one".