215555051 has 2 divisors, whose sum is σ = 215555052. Its totient is φ = 215555050.

The previous prime is 215555027. The next prime is 215555111. The reversal of 215555051 is 150555512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215555051 - 2¹⁸ = 215292907 is a prime.

It is a super-2 number, since 2×215555051² = 92927960023225202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215555251) 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, 107777525 + 107777526.

It is an arithmetic number, because the mean of its divisors is an integer number (107777526).

Almost surely, 2^215555051 is an apocalyptic number.

215555051 is a deficient number, since it is larger than the sum of its proper divisors (1).

215555051 is an equidigital number, since it uses as much as digits as its factorization.

215555051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6250, while the sum is 29.

The square root of 215555051 is about 14681.7931806711. The cubic root of 215555051 is about 599.5877269683.

The spelling of 215555051 in words is "two hundred fifteen million, five hundred fifty-five thousand, fifty-one".