215382997447 has 2 divisors, whose sum is σ = 215382997448. Its totient is φ = 215382997446.

The previous prime is 215382997393. The next prime is 215382997457. The reversal of 215382997447 is 744799283512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215382997447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215382997457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107691498723 + 107691498724.

It is an arithmetic number, because the mean of its divisors is an integer number (107691498724).

Almost surely, 2^215382997447 is an apocalyptic number.

215382997447 is a deficient number, since it is larger than the sum of its proper divisors (1).

215382997447 is an equidigital number, since it uses as much as digits as its factorization.

215382997447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30481920, while the sum is 61.

The spelling of 215382997447 in words is "two hundred fifteen billion, three hundred eighty-two million, nine hundred ninety-seven thousand, four hundred forty-seven".