994186473921 has 27 divisors (see below), whose sum is σ = 1463887026147. Its totient is φ = 650181795120.

The previous prime is 994186473823. The next prime is 994186473961. The reversal of 994186473921 is 129374681499.

The square root of 994186473921 is 997089.

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

994186473921 is a `hidden beast` number, since 9 + 9 + 418 + 64 + 73 + 92 + 1 = 666.

994186473921 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 716706162225 + 277480311696 = 846585^2 + 526764^2 .

It is not a de Polignac number, because 994186473921 - 2¹⁵ = 994186441153 is a prime.

It is a super-2 number, since 2×994186473921² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (994186473961) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 158534016 + ... + 158540286.

Almost surely, 2^994186473921 is an apocalyptic number.

994186473921 is the 997089-th square number.

994186473921 is the 498545-th centered octagonal number.

It is an amenable number.

994186473921 is a deficient number, since it is larger than the sum of its proper divisors (469700552226).

994186473921 is an frugal number, since it uses more digits than its factorization.

994186473921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12654 (or 6327 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The spelling of 994186473921 in words is "nine hundred ninety-four billion, one hundred eighty-six million, four hundred seventy-three thousand, nine hundred twenty-one".