978573561 has 12 divisors (see below), whose sum is σ = 1517787792. Its totient is φ = 559184808.

The previous prime is 978573517. The next prime is 978573581. The reversal of 978573561 is 165375879.

It is a de Polignac number, because none of the positive numbers 2^k-978573561 is a prime.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (978573581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3328335 + ... + 3328628.

It is an arithmetic number, because the mean of its divisors is an integer number (126482316).

Almost surely, 2^978573561 is an apocalyptic number.

It is an amenable number.

978573561 is a deficient number, since it is larger than the sum of its proper divisors (539214231).

978573561 is a wasteful number, since it uses less digits than its factorization.

978573561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656980 (or 6656973 counting only the distinct ones).

The product of its digits is 1587600, while the sum is 51.

The square root of 978573561 is about 31282.1604273106. The cubic root of 978573561 is about 992.8062273958.

The spelling of 978573561 in words is "nine hundred seventy-eight million, five hundred seventy-three thousand, five hundred sixty-one".