978861601 has 2 divisors, whose sum is σ = 978861602. Its totient is φ = 978861600.

The previous prime is 978861557. The next prime is 978861613. The reversal of 978861601 is 106168879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633830976 + 345030625 = 25176^2 + 18575^2 .

It is an emirp because it is prime and its reverse (106168879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978861601 - 2¹³ = 978853409 is a prime.

It is not a weakly prime, because it can be changed into another prime (978861701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489430800 + 489430801.

It is an arithmetic number, because the mean of its divisors is an integer number (489430801).

Almost surely, 2^978861601 is an apocalyptic number.

It is an amenable number.

978861601 is a deficient number, since it is larger than the sum of its proper divisors (1).

978861601 is an equidigital number, since it uses as much as digits as its factorization.

978861601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 978861601 is about 31286.7639905440. The cubic root of 978861601 is about 992.9036276199.

The spelling of 978861601 in words is "nine hundred seventy-eight million, eight hundred sixty-one thousand, six hundred one".