978581273 has 4 divisors (see below), whose sum is σ = 985724340. Its totient is φ = 971438208.

The previous prime is 978581269. The next prime is 978581287. The reversal of 978581273 is 372185879.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 705274249 + 273307024 = 26557^2 + 16532^2 .

It is a cyclic number.

It is not a de Polignac number, because 978581273 - 2² = 978581269 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978581203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3571328 + ... + 3571601.

It is an arithmetic number, because the mean of its divisors is an integer number (246431085).

Almost surely, 2^978581273 is an apocalyptic number.

It is an amenable number.

978581273 is a deficient number, since it is larger than the sum of its proper divisors (7143067).

978581273 is a wasteful number, since it uses less digits than its factorization.

978581273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7143066.

The product of its digits is 846720, while the sum is 50.

The square root of 978581273 is about 31282.2836922115. The cubic root of 978581273 is about 992.8088354442.

The spelling of 978581273 in words is "nine hundred seventy-eight million, five hundred eighty-one thousand, two hundred seventy-three".