215142881 has 2 divisors, whose sum is σ = 215142882. Its totient is φ = 215142880.

The previous prime is 215142877. The next prime is 215142911. The reversal of 215142881 is 188241512.

215142881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215062225 + 80656 = 14665^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 215142881 - 2² = 215142877 is a prime.

It is a super-2 number, since 2×215142881² = 92572918489960322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (215142481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107571440 + 107571441.

It is an arithmetic number, because the mean of its divisors is an integer number (107571441).

Almost surely, 2^215142881 is an apocalyptic number.

It is an amenable number.

215142881 is a deficient number, since it is larger than the sum of its proper divisors (1).

215142881 is an equidigital number, since it uses as much as digits as its factorization.

215142881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5120, while the sum is 32.

The square root of 215142881 is about 14667.7496910740. The cubic root of 215142881 is about 599.2053192318.

The spelling of 215142881 in words is "two hundred fifteen million, one hundred forty-two thousand, eight hundred eighty-one".