108215581 has 2 divisors, whose sum is σ = 108215582. Its totient is φ = 108215580.

The previous prime is 108215561. The next prime is 108215587. The reversal of 108215581 is 185512801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93431556 + 14784025 = 9666^2 + 3845^2 .

It is a cyclic number.

It is not a de Polignac number, because 108215581 - 2¹⁹ = 107691293 is a prime.

It is a super-2 number, since 2×108215581² = 23421223942335122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108215587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54107790 + 54107791.

It is an arithmetic number, because the mean of its divisors is an integer number (54107791).

Almost surely, 2^108215581 is an apocalyptic number.

It is an amenable number.

108215581 is a deficient number, since it is larger than the sum of its proper divisors (1).

108215581 is an equidigital number, since it uses as much as digits as its factorization.

108215581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3200, while the sum is 31.

The square root of 108215581 is about 10402.6718202585. The cubic root of 108215581 is about 476.5369693484.

The spelling of 108215581 in words is "one hundred eight million, two hundred fifteen thousand, five hundred eighty-one".