215532061 has 2 divisors, whose sum is σ = 215532062. Its totient is φ = 215532060.

The previous prime is 215532059. The next prime is 215532139. The reversal of 215532061 is 160235512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182412036 + 33120025 = 13506^2 + 5755^2 .

It is a cyclic number.

It is not a de Polignac number, because 215532061 - 2¹ = 215532059 is a prime.

Together with 215532059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215532041) 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, 107766030 + 107766031.

It is an arithmetic number, because the mean of its divisors is an integer number (107766031).

Almost surely, 2^215532061 is an apocalyptic number.

It is an amenable number.

215532061 is a deficient number, since it is larger than the sum of its proper divisors (1).

215532061 is an equidigital number, since it uses as much as digits as its factorization.

215532061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 215532061 is about 14681.0102172841. The cubic root of 215532061 is about 599.5664098897.

Adding to 215532061 its reverse (160235512), we get a palindrome (375767573).

The spelling of 215532061 in words is "two hundred fifteen million, five hundred thirty-two thousand, sixty-one".