215142911 has 2 divisors, whose sum is σ = 215142912. Its totient is φ = 215142910.

The previous prime is 215142881. The next prime is 215142919. The reversal of 215142911 is 119241512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215142911 - 2¹⁸ = 214880767 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215142919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107571455 + 107571456.

It is an arithmetic number, because the mean of its divisors is an integer number (107571456).

Almost surely, 2^215142911 is an apocalyptic number.

215142911 is a deficient number, since it is larger than the sum of its proper divisors (1).

215142911 is an equidigital number, since it uses as much as digits as its factorization.

215142911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 26.

The square root of 215142911 is about 14667.7507137257. The cubic root of 215142911 is about 599.2053470833.

The spelling of 215142911 in words is "two hundred fifteen million, one hundred forty-two thousand, nine hundred eleven".