99581947 has 2 divisors, whose sum is σ = 99581948. Its totient is φ = 99581946.

The previous prime is 99581941. The next prime is 99581987. The reversal of 99581947 is 74918599.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99581947 - 2³ = 99581939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99581894 and 99581903.

It is not a weakly prime, because it can be changed into another prime (99581941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49790973 + 49790974.

It is an arithmetic number, because the mean of its divisors is an integer number (49790974).

Almost surely, 2^99581947 is an apocalyptic number.

99581947 is a deficient number, since it is larger than the sum of its proper divisors (1).

99581947 is an equidigital number, since it uses as much as digits as its factorization.

99581947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 52.

The square root of 99581947 is about 9979.0754581775. The cubic root of 99581947 is about 463.5111698802.

The spelling of 99581947 in words is "ninety-nine million, five hundred eighty-one thousand, nine hundred forty-seven".