215075261 has 2 divisors, whose sum is σ = 215075262. Its totient is φ = 215075260.

The previous prime is 215075251. The next prime is 215075309. The reversal of 215075261 is 162570512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214036900 + 1038361 = 14630^2 + 1019^2 .

It is a cyclic number.

It is not a de Polignac number, because 215075261 - 2¹⁸ = 214813117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215075221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107537630 + 107537631.

It is an arithmetic number, because the mean of its divisors is an integer number (107537631).

Almost surely, 2^215075261 is an apocalyptic number.

It is an amenable number.

215075261 is a deficient number, since it is larger than the sum of its proper divisors (1).

215075261 is an equidigital number, since it uses as much as digits as its factorization.

215075261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 215075261 is about 14665.4444528627. Note that the first 4 decimals coincide. The cubic root of 215075261 is about 599.1425353596.

The spelling of 215075261 in words is "two hundred fifteen million, seventy-five thousand, two hundred sixty-one".