10218531 has 8 divisors (see below), whose sum is σ = 13640704. Its totient is φ = 6804360.

The previous prime is 10218521. The next prime is 10218539. The reversal of 10218531 is 13581201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10218531 - 2¹⁷ = 10087459 is a prime.

It is a super-2 number, since 2×10218531² = 208836751595922, 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 = 10218498 and 10218507.

It is not an unprimeable number, because it can be changed into a prime (10218539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2310 + ... + 5076.

It is an arithmetic number, because the mean of its divisors is an integer number (1705088).

Almost surely, 2^10218531 is an apocalyptic number.

10218531 is a deficient number, since it is larger than the sum of its proper divisors (3422173).

10218531 is a wasteful number, since it uses less digits than its factorization.

10218531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 10218531 is about 3196.6437086419. The cubic root of 10218531 is about 217.0015431661.

Adding to 10218531 its reverse (13581201), we get a palindrome (23799732).

The spelling of 10218531 in words is "ten million, two hundred eighteen thousand, five hundred thirty-one".