215140969 has 2 divisors, whose sum is σ = 215140970. Its totient is φ = 215140968.

The previous prime is 215140931. The next prime is 215140973. The reversal of 215140969 is 969041512.

215140969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118374400 + 96766569 = 10880^2 + 9837^2 .

It is a cyclic number.

It is not a de Polignac number, because 215140969 - 2⁷ = 215140841 is a prime.

It is a super-2 number, since 2×215140969² = 92571273084517922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215140469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107570484 + 107570485.

It is an arithmetic number, because the mean of its divisors is an integer number (107570485).

Almost surely, 2^215140969 is an apocalyptic number.

It is an amenable number.

215140969 is a deficient number, since it is larger than the sum of its proper divisors (1).

215140969 is an equidigital number, since it uses as much as digits as its factorization.

215140969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 215140969 is about 14667.6845139238. The cubic root of 215140969 is about 599.2035441572.

The spelling of 215140969 in words is "two hundred fifteen million, one hundred forty thousand, nine hundred sixty-nine".