821024947 has 2 divisors, whose sum is σ = 821024948. Its totient is φ = 821024946.

The previous prime is 821024933. The next prime is 821024983. The reversal of 821024947 is 749420128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 821024947 - 2²³ = 812636339 is a prime.

It is not a weakly prime, because it can be changed into another prime (821024147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410512473 + 410512474.

It is an arithmetic number, because the mean of its divisors is an integer number (410512474).

Almost surely, 2^821024947 is an apocalyptic number.

821024947 is a deficient number, since it is larger than the sum of its proper divisors (1).

821024947 is an equidigital number, since it uses as much as digits as its factorization.

821024947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 821024947 is about 28653.5328886335. The cubic root of 821024947 is about 936.3799756807.

The spelling of 821024947 in words is "eight hundred twenty-one million, twenty-four thousand, nine hundred forty-seven".