215256061 has 2 divisors, whose sum is σ = 215256062. Its totient is φ = 215256060.

The previous prime is 215256053. The next prime is 215256077. The reversal of 215256061 is 160652512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152053561 + 63202500 = 12331^2 + 7950^2 .

It is a cyclic number.

It is not a de Polignac number, because 215256061 - 2³ = 215256053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215256001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107628030 + 107628031.

It is an arithmetic number, because the mean of its divisors is an integer number (107628031).

Almost surely, 2^215256061 is an apocalyptic number.

It is an amenable number.

215256061 is a deficient number, since it is larger than the sum of its proper divisors (1).

215256061 is an equidigital number, since it uses as much as digits as its factorization.

215256061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 215256061 is about 14671.6073079946. The cubic root of 215256061 is about 599.3103752591.

The spelling of 215256061 in words is "two hundred fifteen million, two hundred fifty-six thousand, sixty-one".