978231559 has 2 divisors, whose sum is σ = 978231560. Its totient is φ = 978231558.

The previous prime is 978231497. The next prime is 978231589. The reversal of 978231559 is 955132879.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 978231559 - 2¹⁵ = 978198791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978231589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489115779 + 489115780.

It is an arithmetic number, because the mean of its divisors is an integer number (489115780).

Almost surely, 2^978231559 is an apocalyptic number.

978231559 is a deficient number, since it is larger than the sum of its proper divisors (1).

978231559 is an equidigital number, since it uses as much as digits as its factorization.

978231559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 49.

The square root of 978231559 is about 31276.6935432760. The cubic root of 978231559 is about 992.6905551929.

The spelling of 978231559 in words is "nine hundred seventy-eight million, two hundred thirty-one thousand, five hundred fifty-nine".