215650992281 has 2 divisors, whose sum is σ = 215650992282. Its totient is φ = 215650992280.

The previous prime is 215650992257. The next prime is 215650992353. The reversal of 215650992281 is 182299056512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186011926681 + 29639065600 = 431291^2 + 172160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215650992281 is a prime.

It is a super-2 number, since 2×215650992281² (a number of 23 digits) 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 (215650992181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107825496140 + 107825496141.

It is an arithmetic number, because the mean of its divisors is an integer number (107825496141).

Almost surely, 2^215650992281 is an apocalyptic number.

It is an amenable number.

215650992281 is a deficient number, since it is larger than the sum of its proper divisors (1).

215650992281 is an equidigital number, since it uses as much as digits as its factorization.

215650992281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 50.

The spelling of 215650992281 in words is "two hundred fifteen billion, six hundred fifty million, nine hundred ninety-two thousand, two hundred eighty-one".