215085851 has 2 divisors, whose sum is σ = 215085852. Its totient is φ = 215085850.

The previous prime is 215085797. The next prime is 215085901. The reversal of 215085851 is 158580512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215085851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215085151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107542925 + 107542926.

It is an arithmetic number, because the mean of its divisors is an integer number (107542926).

Almost surely, 2^215085851 is an apocalyptic number.

215085851 is a deficient number, since it is larger than the sum of its proper divisors (1).

215085851 is an equidigital number, since it uses as much as digits as its factorization.

215085851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16000, while the sum is 35.

The square root of 215085851 is about 14665.8055012331. The cubic root of 215085851 is about 599.1523688403.

The spelling of 215085851 in words is "two hundred fifteen million, eighty-five thousand, eight hundred fifty-one".