215225947 has 2 divisors, whose sum is σ = 215225948. Its totient is φ = 215225946.

The previous prime is 215225837. The next prime is 215225987. The reversal of 215225947 is 749522512.

215225947 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 is a cyclic number.

It is not a de Polignac number, because 215225947 - 2⁷ = 215225819 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215225987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107612973 + 107612974.

It is an arithmetic number, because the mean of its divisors is an integer number (107612974).

Almost surely, 2^215225947 is an apocalyptic number.

215225947 is a deficient number, since it is larger than the sum of its proper divisors (1).

215225947 is an equidigital number, since it uses as much as digits as its factorization.

215225947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 215225947 is about 14670.5810041729. The cubic root of 215225947 is about 599.2824264150.

The spelling of 215225947 in words is "two hundred fifteen million, two hundred twenty-five thousand, nine hundred forty-seven".