10215581 has 2 divisors, whose sum is σ = 10215582. Its totient is φ = 10215580.

The previous prime is 10215563. The next prime is 10215587. The reversal of 10215581 is 18551201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5331481 + 4884100 = 2309^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 10215581 - 2¹⁴ = 10199197 is a prime.

It is a super-2 number, since 2×10215581² = 208716190335122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10215587) 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 as a sum of consecutive naturals, namely, 5107790 + 5107791.

It is an arithmetic number, because the mean of its divisors is an integer number (5107791).

Almost surely, 2^10215581 is an apocalyptic number.

It is an amenable number.

10215581 is a deficient number, since it is larger than the sum of its proper divisors (1).

10215581 is an equidigital number, since it uses as much as digits as its factorization.

10215581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 10215581 is about 3196.1822538773. The cubic root of 10215581 is about 216.9806590108.

Adding to 10215581 its reverse (18551201), we get a palindrome (28766782).

The spelling of 10215581 in words is "ten million, two hundred fifteen thousand, five hundred eighty-one".