6398531 has 16 divisors (see below), whose sum is σ = 7076160. Its totient is φ = 5765760.

The previous prime is 6398519. The next prime is 6398537. The reversal of 6398531 is 1358936.

It is a cyclic number.

It is not a de Polignac number, because 6398531 - 2⁶ = 6398467 is a prime.

It is a super-2 number, since 2×6398531² = 81882397915922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6398491 and 6398500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6398537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35261 + ... + 35441.

It is an arithmetic number, because the mean of its divisors is an integer number (442260).

Almost surely, 2^6398531 is an apocalyptic number.

6398531 is a deficient number, since it is larger than the sum of its proper divisors (677629).

6398531 is a wasteful number, since it uses less digits than its factorization.

6398531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286.

The product of its digits is 19440, while the sum is 35.

The square root of 6398531 is about 2529.5317748548. The cubic root of 6398531 is about 185.6493470617.

The spelling of 6398531 in words is "six million, three hundred ninety-eight thousand, five hundred thirty-one".