978993492481 has 3 divisors (see below), whose sum is σ = 978994481923. Its totient is φ = 978992503040.

The previous prime is 978993492443. The next prime is 978993492487. The reversal of 978993492481 is 184294399879.

The square root of 978993492481 is 989441.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 184294399879 = 16319 ⋅11293241.

It can be written as a sum of positive squares in only one way, i.e., 416013390081 + 562980102400 = 644991^2 + 750320^2 .

It is not a de Polignac number, because 978993492481 - 2⁷ = 978993492353 is a prime.

It is a super-2 number, since 2×978993492481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978993492487) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 494721 + ... + 1484161.

Almost surely, 2^978993492481 is an apocalyptic number.

978993492481 is the 989441-st square number.

978993492481 is the 494721-st centered octagonal number.

It is an amenable number.

978993492481 is a deficient number, since it is larger than the sum of its proper divisors (989442).

978993492481 is an frugal number, since it uses more digits than its factorization.

978993492481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978882 (or 989441 counting only the distinct ones).

The product of its digits is 282175488, while the sum is 73.

The spelling of 978993492481 in words is "nine hundred seventy-eight billion, nine hundred ninety-three million, four hundred ninety-two thousand, four hundred eighty-one".