978543899 has 2 divisors, whose sum is σ = 978543900. Its totient is φ = 978543898.

The previous prime is 978543877. The next prime is 978543959. The reversal of 978543899 is 998345879.

It is a weak prime.

It is an emirp because it is prime and its reverse (998345879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978543899 - 2¹⁶ = 978478363 is a prime.

It is not a weakly prime, because it can be changed into another prime (978543829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489271949 + 489271950.

It is an arithmetic number, because the mean of its divisors is an integer number (489271950).

Almost surely, 2^978543899 is an apocalyptic number.

978543899 is a deficient number, since it is larger than the sum of its proper divisors (1).

978543899 is an equidigital number, since it uses as much as digits as its factorization.

978543899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 62.

The square root of 978543899 is about 31281.6863196344. The cubic root of 978543899 is about 992.7961961568.

The spelling of 978543899 in words is "nine hundred seventy-eight million, five hundred forty-three thousand, eight hundred ninety-nine".