978639041 has 2 divisors, whose sum is σ = 978639042. Its totient is φ = 978639040.

The previous prime is 978638989. The next prime is 978639047. The reversal of 978639041 is 140936879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 874680625 + 103958416 = 29575^2 + 10196^2 .

It is a cyclic number.

It is not a de Polignac number, because 978639041 - 2¹⁸ = 978376897 is a prime.

It is not a weakly prime, because it can be changed into another prime (978639047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489319520 + 489319521.

It is an arithmetic number, because the mean of its divisors is an integer number (489319521).

Almost surely, 2^978639041 is an apocalyptic number.

It is an amenable number.

978639041 is a deficient number, since it is larger than the sum of its proper divisors (1).

978639041 is an equidigital number, since it uses as much as digits as its factorization.

978639041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 978639041 is about 31283.2070127089. The cubic root of 978639041 is about 992.8283710222.

The spelling of 978639041 in words is "nine hundred seventy-eight million, six hundred thirty-nine thousand, forty-one".