215225993 has 2 divisors, whose sum is σ = 215225994. Its totient is φ = 215225992.

The previous prime is 215225987. The next prime is 215226017. The reversal of 215225993 is 399522512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125507209 + 89718784 = 11203^2 + 9472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215225993 is a prime.

It is not a weakly prime, because it can be changed into another prime (215225093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107612996 + 107612997.

It is an arithmetic number, because the mean of its divisors is an integer number (107612997).

Almost surely, 2^215225993 is an apocalyptic number.

It is an amenable number.

215225993 is a deficient number, since it is larger than the sum of its proper divisors (1).

215225993 is an equidigital number, since it uses as much as digits as its factorization.

215225993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 38.

The square root of 215225993 is about 14670.5825719363. The cubic root of 215225993 is about 599.2824691096.

The spelling of 215225993 in words is "two hundred fifteen million, two hundred twenty-five thousand, nine hundred ninety-three".