84581947 has 2 divisors, whose sum is σ = 84581948. Its totient is φ = 84581946.

The previous prime is 84581941. The next prime is 84581983. The reversal of 84581947 is 74918548.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84581947 - 2¹¹ = 84579899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84581897 and 84581906.

It is not a weakly prime, because it can be changed into another prime (84581941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42290973 + 42290974.

It is an arithmetic number, because the mean of its divisors is an integer number (42290974).

Almost surely, 2^84581947 is an apocalyptic number.

84581947 is a deficient number, since it is larger than the sum of its proper divisors (1).

84581947 is an equidigital number, since it uses as much as digits as its factorization.

84581947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 84581947 is about 9196.8444044683. The cubic root of 84581947 is about 438.9609556342.

The spelling of 84581947 in words is "eighty-four million, five hundred eighty-one thousand, nine hundred forty-seven".