215225987 has 2 divisors, whose sum is σ = 215225988. Its totient is φ = 215225986.

The previous prime is 215225947. The next prime is 215225993. The reversal of 215225987 is 789522512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215225987 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215225947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107612993 + 107612994.

It is an arithmetic number, because the mean of its divisors is an integer number (107612994).

Almost surely, 2^215225987 is an apocalyptic number.

215225987 is a deficient number, since it is larger than the sum of its proper divisors (1).

215225987 is an equidigital number, since it uses as much as digits as its factorization.

215225987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The square root of 215225987 is about 14670.5823674454. The cubic root of 215225987 is about 599.2824635407.

The spelling of 215225987 in words is "two hundred fifteen million, two hundred twenty-five thousand, nine hundred eighty-seven".